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GS88218/36BB/D-250/225/200/166/150/133 |
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119and 165-Bump BGA |
512K x 18, 256K x 36 |
250 MHz–133MHz |
|||
Commercial Temp |
9Mb SCD/DCD Sync Burst SRAMs |
2.5 V or 3.3 V VDD |
|||
Industrial Temp |
2.5 V or 3.3 V I/O |
Features
•FT pin for user-configurable flow through or pipeline operation
•Single/Dual Cycle Deselect selectable
•IEEE 1149.1 JTAG-compatible Boundary Scan
•On-chip read parity checking; even or odd selectable
•ZQ mode pin for user-selectable high/low output drive
•2.5 V or 3.3 V +10%/–10% core power supply
•2.5 V or 3.3 V I/O supply
•LBO pin for Linear or Interleaved Burst mode
•Internal input resistors on mode pins allow floating mode pins
•Default to SCD x18/x36 Interleaved Pipeline mode
•Byte Write (BW) and/or Global Write (GW) operation
•Internal self-timed write cycle
•Automatic power-down for portable applications
•JEDEC-standard 119and 165-bump BGA packages
|
|
-250 |
-225 |
-200 |
-166 -150 -133 Unit |
||||
Pipeline |
tKQ |
2.5 |
2.7 |
3.0 |
3.4 |
3.8 |
4.0 |
ns |
|
3-1-1-1 |
tCycle |
4.0 |
4.4 |
5.0 |
6.0 |
6.7 |
7.5 |
ns |
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3.3 V |
Curr (x18) |
280 |
255 |
230 |
200 |
185 |
165 |
mA |
|
Curr (x32/x36) |
330 |
300 |
270 |
230 |
215 |
190 |
mA |
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2.5 V |
Curr (x18) |
275 |
250 |
230 |
195 |
180 |
165 |
mA |
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Curr (x32/x36) |
320 |
295 |
265 |
225 |
210 |
185 |
mA |
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Flow |
tKQ |
5.5 |
6.0 |
6.5 |
7.0 |
7.5 |
8.5 |
ns |
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Through |
|||||||||
tCycle |
5.5 |
6.0 |
6.5 |
7.0 |
7.5 |
8.5 |
ns |
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2-1-1-1 |
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3.3 V |
Curr (x18) |
175 |
165 |
160 |
150 |
145 |
135 |
mA |
|
Curr (x32/x36) |
200 |
190 |
180 |
170 |
165 |
150 |
mA |
||
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|||||||||
2.5 V |
Curr (x18) |
175 |
165 |
160 |
150 |
145 |
135 |
mA |
|
Curr (x32/x36) |
200 |
190 |
180 |
170 |
165 |
150 |
mA |
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Functional Description
either linear or interleave order with the Linear Burst Order (LBO) input. The Burst function need not be used. New addresses can be loaded on every cycle with no degradation of chip performance.
Flow Through/Pipeline Reads
The function of the Data Output register can be controlled by the user via the FT mode . Holding the FT mode pin low places the RAM in Flow Through mode, causing output data to bypass the Data Output Register. Holding FT high places the RAM in Pipeline mode, activating the rising-edge-triggered Data Output Register.
SCD and DCD Pipelined Reads
The GS88218/36B is a SCD (Single Cycle Deselect) and DCD (Dual Cycle Deselect) pipelined synchronous SRAM. DCD SRAMs pipeline disable commands to the same degree as read commands. SCD SRAMs pipeline deselect commands one stage less than read commands. SCD RAMs begin turning off their outputs immediately after the deselect command has been captured in the input registers. DCD RAMs hold the deselect command for one full cycle and then begin turning off their outputs just after the second rising edge of clock. The user may configure this SRAM for either mode of operation using the SCD mode input.
Byte Write and Global Write
Byte write operation is performed by using Byte Write enable (BW) input combined with one or more individual byte write signals (Bx). In addition, Global Write (GW) is available for writing all bytes at one time, regardless of the Byte Write control inputs.
FLXDrive™
The ZQ pin allows selection between high drive strength (ZQ low) for multi-drop bus applications and normal drive strength (ZQ floating or high) point-to-point applications. See the Output Driver Characteristics chart for details.
Applications
The GS88218/36B is a 9,437,184-bit high performance synchronous SRAM with a 2-bit burst address counter. Although of a type originally developed for Level 2 Cache applications supporting high performance CPUs, the device now finds application in synchronous SRAM applications, ranging from DSP main store to networking chip set support.
Controls
Addresses, data I/Os, chip enable (E1), address burst control inputs (ADSP, ADSC, ADV), and write control inputs (Bx, BW, GW) are synchronous and are controlled by a positive-edge- triggered clock input (CK). Output enable (G) and power down control (ZZ) are asynchronous inputs. Burst cycles can be initiated with either ADSP or ADSC inputs. In Burst mode, subsequent burst addresses are generated internally and are controlled by ADV. The burst address counter may be configured to count in
Sleep Mode
Low power (Sleep mode) is attained through the assertion (High) of the ZZ signal, or by stopping the clock (CK). Memory data is retained during Sleep mode.
Core and Interface Voltages
The GS88218/36B operates on a 2.5 V or 3.3 V power supply. All input are 3.3 V and 2.5 V compatible. Separate output power (VDDQ) pins are used to decouple output noise from the internal
circuits and are 3.3 V and 2.5 V compatible.
Rev: 1.00b 12/2002 |
1/33 |
© 2001, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
ByteSafe is a Trademark of Giga Semiconductor, Inc. (GSI Technology).
GS88218/36BB/D-250/225/200/166/150/133
165 Bump BGA—x18 Commom I/O—Top View (Package D)
|
1 |
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2 |
3 |
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4 |
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5 |
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6 |
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7 |
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8 |
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9 |
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10 |
11 |
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A |
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NC |
A |
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NC |
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A |
A18 |
A |
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E1 |
BB |
E3 |
BW |
ADSC |
ADV |
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B |
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NC |
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A |
E2 |
NC |
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CK |
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A |
NC |
B |
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BA |
GW |
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G |
ADSP |
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C |
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NC |
NC |
VDDQ |
VSS |
VSS |
VSS |
VSS |
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VSS |
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VDDQ |
NC |
DQA |
C |
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D |
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NC |
DQB |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
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VDDQ |
NC |
DQA |
D |
||||||||||||||||||||
E |
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NC |
DQB |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
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VDDQ |
NC |
DQA |
E |
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F |
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NC |
DQB |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
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VDDQ |
NC |
DQA |
F |
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G |
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NC |
DQB |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
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VDDQ |
NC |
DQA |
G |
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H |
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MCL |
NC |
VDD |
VSS |
VSS |
VSS |
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VDD |
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NC |
ZQ |
ZZ |
H |
||||||||||||||||
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FT |
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||||||||||||||||||||||||||||||
J |
DQB |
NC |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
|
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VDDQ |
DQA |
NC |
J |
|||||||||||||||||||||
K |
DQB |
NC |
VDDQ |
VDD |
VSS |
VSS |
VSS |
|
VDD |
|
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VDDQ |
DQA |
NC |
K |
|||||||||||||||||||||
L |
DQB |
NC |
VDDQ |
VDD |
VSS |
VSS |
VSS |
|
VDD |
|
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VDDQ |
DQA |
NC |
L |
|||||||||||||||||||||
M |
DQB |
NC |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
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VDDQ |
DQA |
NC |
M |
|||||||||||||||||||||
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SCD |
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N |
DQB |
VDDQ |
VSS |
NC |
NC |
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NC |
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VSS |
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VDDQ |
NC |
NC |
N |
||||||||||||||||||||
P |
|
NC |
NC |
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A |
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A |
TDI |
A1 |
TDO |
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A |
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A |
A |
A17 |
P |
||||||||||||||||
R |
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NC |
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A |
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A |
TMS |
A0 |
TCK |
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A |
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A |
A |
A |
R |
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LBO |
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11 x 15 Bump BGA—13mm x 15 mm Body—1.0 mm Bump Pitch |
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Rev: 1.00b 12/2002 |
2/33 |
© 2001, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
GS88218/36BB/D-250/225/200/166/150/133
165 Bump BGA—x36 Common I/O—Top View (Package D)
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1 |
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2 |
3 |
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4 |
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5 |
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6 |
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7 |
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8 |
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9 |
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10 |
11 |
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A |
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NC |
A |
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A |
NC |
A |
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E1 |
BC |
BB |
E3 |
BW |
ADSC |
ADV |
|||||||||||||||||||||||||||||||
B |
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NC |
A |
E2 |
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CK |
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A |
NC |
B |
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BD |
BA |
GW |
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G |
ADSP |
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C |
DQC |
NC |
VDDQ |
VSS |
VSS |
VSS |
VSS |
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VSS |
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VDDQ |
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NC |
DQB |
C |
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D |
DQC |
DQC |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
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VDDQ |
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DQB |
DQB |
D |
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E |
DQC |
DQC |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
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VDDQ |
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DQB |
DQB |
E |
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F |
DQC |
DQC |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
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VDDQ |
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DQB |
DQB |
F |
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G |
DQC |
DQC |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
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VDDQ |
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DQB |
DQB |
G |
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H |
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MCL |
NC |
VDD |
VSS |
VSS |
VSS |
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VDD |
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NC |
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ZQ |
ZZ |
H |
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FT |
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J |
DQD |
DQD |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
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VDDQ |
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DQA |
DQA |
J |
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K |
DQD |
DQD |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
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VDDQ |
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DQA |
DQA |
K |
|||||||||||||||||||||
L |
DQD |
DQD |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
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VDDQ |
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DQA |
DQA |
L |
|||||||||||||||||||||
M |
DQD |
DQD |
VDDQ |
VDD |
VSS |
VSS |
VSS |
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VDD |
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VDDQ |
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DQA |
DQA |
M |
|||||||||||||||||||||
N |
DQD |
SCD |
VDDQ |
VSS |
NC |
NC |
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NC |
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VSS |
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VDDQ |
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NC |
DQA |
N |
|||||||||||||||||||
P |
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NC |
NC |
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A |
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A |
TDI |
A1 |
TDO |
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A |
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A |
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A |
A17 |
P |
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R |
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NC |
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A |
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A |
TMS |
A0 |
TCK |
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A |
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A |
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A |
A |
R |
||||||||||||||
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LBO |
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11 x 15 Bump BGA—13mm x 15 mm Body—1.0 mm Bump Pitch |
|
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|
Rev: 1.00b 12/2002 |
3/33 |
© 2001, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
GS88218/36BB/D-250/225/200/166/150/133
GS88236B Pad Out
119 Bump BGA—Top View
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1 |
2 |
3 |
4 |
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5 |
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6 |
7 |
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A |
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VDDQ |
A6 |
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A7 |
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A8 |
A9 |
VDDQ |
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ADSP |
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B |
NC |
E2 |
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A4 |
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A15 |
A17 |
NC |
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ADSC |
|||||||||||||||||||||||||||||
C |
NC |
A5 |
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A3 |
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VDD |
A14 |
A16 |
NC |
||||||||||||||||||
D |
DQC4 |
DQC9 |
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VSS |
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ZQ |
VSS |
DQB9 |
DQB4 |
||||||||||||||||||
E |
DQC3 |
DQC8 |
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VSS |
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1 |
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VSS |
DQB8 |
DQB3 |
||||||||||||
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E |
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F |
VDDQ |
DQC7 |
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VSS |
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VSS |
DQB7 |
VDDQ |
||||||||||||
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G |
||||||||||||||||||||||||
G |
DQC2 |
DQC6 |
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C |
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B |
DQB6 |
DQB2 |
||||||||||
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B |
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ADV |
B |
||||||||||||||||||||||||
H |
DQC1 |
DQC5 |
|
VSS |
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VSS |
DQB5 |
DQB1 |
||||||||||||||||
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|
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GW |
||||||||||||||||||||||||||
J |
VDDQ |
VDD |
|
NC |
|
|
VDD |
NC |
VDD |
VDDQ |
|||||||||||||||||||
K |
DQD1 |
DQD5 |
|
VSS |
|
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|
CK |
VSS |
DQA5 |
DQA1 |
||||||||||||||||||
L |
DQD2 |
DQD6 |
|
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D |
|
SCD |
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A |
DQA6 |
DQA2 |
|||||||||||||||
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B |
|
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B |
||||||||||||||||||||||||
M |
VDDQ |
DQD7 |
|
VSS |
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|
VSS |
DQA7 |
VDDQ |
|||||||||||||||||
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BW |
||||||||||||||||||||||||||
N |
DQD3 |
DQD8 |
|
VSS |
|
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A1 |
VSS |
DQA8 |
DQA3 |
|||||||||||||||||
P |
DQD4 |
DQD9 |
|
VSS |
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A0 |
VSS |
DQA9 |
DQA4 |
|||||||||||||||||
R |
NC |
A2 |
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VDD |
|
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A13 |
|
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|
||||||||||||||
LBO |
|
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FT |
PE |
||||||||||||||||||||||||
T |
NC |
NC |
|
A10 |
|
|
|
A11 |
A12 |
NC |
|
ZZ |
|||||||||||||||||
U |
VDDQ |
TMS |
|
TDI |
|
|
TCK |
TDO |
NC |
VDDQ |
Rev: 1.00b 12/2002 |
4/33 |
© 2001, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
GS88218/36BB/D-250/225/200/166/150/133
GS88218B Pad Out
119 Bump BGA—Top View
|
1 |
2 |
3 |
4 |
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5 |
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6 |
7 |
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A |
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VDDQ |
A6 |
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A7 |
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A8 |
A9 |
VDDQ |
||||||
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ADSP |
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B |
NC |
E2 |
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A4 |
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A15 |
A17 |
NC |
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ADSC |
||||||||||||||||||||||||||||
C |
NC |
A5 |
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A3 |
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VDD |
A14 |
A16 |
NC |
|||||||||||||||||
D |
DQB1 |
NC |
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VSS |
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ZQ |
VSS |
DQA9 |
NC |
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E |
NC |
DQB2 |
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VSS |
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1 |
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VSS |
NC |
DQA8 |
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E |
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F |
VDDQ |
NC |
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VSS |
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VSS |
DQA7 |
VDDQ |
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G |
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G |
NC |
DQB3 |
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B |
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NC |
NC |
DQA6 |
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B |
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ADV |
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H |
DQB4 |
NC |
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VSS |
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VSS |
DQA5 |
NC |
|||||||||||||||
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GW |
|||||||||||||||||||||||||
J |
VDDQ |
VDD |
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NC |
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VDD |
NC |
VDD |
VDDQ |
||||||||||||||||||
K |
NC |
DQB5 |
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VSS |
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CK |
VSS |
NC |
DQA4 |
|||||||||||||||||
L |
DQB6 |
NC |
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NC |
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SCD |
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A |
DQA3 |
NC |
||||||||||||||||
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B |
||||||||||||||||||||||||||
M |
VDDQ |
DQB7 |
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VSS |
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VSS |
NC |
VDDQ |
||||||||||||||||
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BW |
|||||||||||||||||||||||||
N |
DQB8 |
NC |
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VSS |
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A1 |
VSS |
DQA2 |
NC |
||||||||||||||||
P |
NC |
DQB9 |
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VSS |
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A0 |
VSS |
NC |
DQA1 |
||||||||||||||||
R |
NC |
A2 |
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VDD |
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A13 |
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|||||||||||||
LBO |
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FT |
PE |
|||||||||||||||||||||||
T |
NC |
A10 |
|
A11 |
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|
|
NC |
A12 |
A18 |
|
ZZ |
||||||||||||||||
U |
VDDQ |
TMS |
|
TDI |
|
|
TCK |
TDO |
NC |
VDDQ |
BPR1999.05.18
Rev: 1.00b 12/2002 |
5/33 |
© 2001, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
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GS88218/36BB/D-250/225/200/166/150/133 |
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GS88218/36 BGA Pin Description |
|||||||||||||||||||||||||
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Symbol |
Type |
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Description |
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A0, A1 |
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I |
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Address field LSBs and Address Counter Preset Inputs |
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An |
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I |
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Address Inputs |
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A17, A18 |
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Address Inputs |
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|||||||||||||||
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DQA1–DQA9 |
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|||||||||||||||
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DQB1–DQB9 |
|
I/O |
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|
Data Input and Output pins |
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|||||||||||||||||
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DQC1–DQC9 |
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DQD1–DQD9 |
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A, |
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B, |
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C, |
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D |
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I |
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|
Byte Write Enable for DQA, DQB, DQC, DQD I/Os; active low |
|
||||||
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B |
B |
B |
B |
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|||||||||||||||||
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NC |
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— |
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No Connect |
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||||||||||||
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||||||||||||
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NC |
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— |
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No Connect |
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||||||||||||
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||||||||||
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CK |
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I |
|
|
Clock Input Signal; active high |
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||||||||||
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I |
|
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Byte Write—Writes all enabled bytes; active low |
|
||
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BW |
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|||||||||||||||
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I |
|
|
Global Write Enable—Writes all bytes; active low |
|
||
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GW |
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|||||||||||||||
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1 |
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I |
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Chip Enable; active low |
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|||
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E |
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|||||||||||||
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3 |
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I |
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Chip Enable; active low |
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|||
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E |
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|||||||||||||
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E2 |
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I |
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Chip Enable; active high |
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|||||||||
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I |
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Output Enable; active low |
|
||
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G |
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||||||||||||
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I |
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|
Burst address counter advance enable; active l0w |
|
||
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ADV |
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|||||||||||||||||
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I |
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Address Strobe (Processor, Cache Controller); active low |
|
||
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ADSC, |
ADSP |
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|||||||||||||||||||
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ZZ |
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I |
|
|
Sleep mode control; active high |
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||||||||||
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I |
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Flow Through or Pipeline mode; active low |
|
||||
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FT |
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|||||||||||||
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I |
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|
Linear Burst Order mode; active low |
|
||||
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LBO |
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||||||||||||||||
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ZQ |
|
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|
I |
|
|
FLXDrive Output Impedance Control (Low = Low Impedance [High Drive], High = High Impedance [Low |
|
||||||||||
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Drive]) |
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||||||||||||
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|||||||||||||
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TMS |
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|
I |
|
|
Scan Test Mode Select |
|
|||||||||||||
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|||||||||||
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TDI |
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|
I |
|
|
Scan Test Data In |
|
|||||||||||
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||||||||||||||
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TDO |
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|
O |
|
|
Scan Test Data Out |
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||||||||||||||
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||||||||||||
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TCK |
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I |
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Scan Test Clock |
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||||||||||||
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|||||||||||||||
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MCL |
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— |
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|
Must Connect Low |
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|||||||||||||||
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|||||||||||||||
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SCD |
|
— |
|
|
Single Cycle Deselect/Dual Cyle Deselect Mode Control |
|
|||||||||||||||
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||||||||||||
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VDD |
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I |
|
|
Core power supply |
|
||||||||||||
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VSS |
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|
I |
|
|
I/O and Core Ground |
|
||||||||||||
|
|
|
|
|
VDDQ |
|
|
|
I |
|
|
Output driver power supply |
|
Rev: 1.00b 12/2002 |
6/33 |
© 2001, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
GS88218/36BB/D-250/225/200/166/150/133
GS88218/36B (PE = 0) Block Diagram
A0–An |
Register |
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D |
Q |
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A0 |
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A0 |
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D0 |
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Q0 |
A1 |
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A1 |
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Q1 |
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D1 |
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Counter |
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A |
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Load |
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LBO |
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Memory |
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ADV |
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CK |
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Array |
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ADSC |
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ADSP |
|
Register |
|
|
Q |
D |
|
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|
GW |
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36 |
36 |
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|
||
BW |
|
D |
Q |
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||
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BA |
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Register |
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D |
Q |
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BB |
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Register |
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4 |
|
4 |
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||
|
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D |
Q |
|
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BC |
|
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|
|
|
Register Q D |
Register D Q |
|
D Q |
|
|
Register |
|
|
Register |
||||
|
|
D |
Q |
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||||
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||
BD |
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Register |
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36 |
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D |
Q |
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36 |
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36 |
E1 |
|
Register |
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D |
Q |
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36 |
|
4 |
32 |
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|
Register |
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Parity |
||
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|
Encode |
|||
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D |
Q |
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||
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4 |
||
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Parity |
|
FT |
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Compare |
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G |
|
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36 |
|
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ZZ |
|
Power Down |
|
|
SCD |
DQx1–DQx9 |
|
NC |
NC |
|
|
|
|
|
|||||
|
Control |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Note: Only x36 version shown for simplicity.
Rev: 1.00b 12/2002 |
7/33 |
© 2001, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
GS88218/36BB/D-250/225/200/166/150/133
GS88218/36B (PE = 1) x32 Mode Block Diagram
A0–An |
Register |
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D |
Q |
|
A0 |
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A0 |
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D0 |
Q0 |
A1 |
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A1 |
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Q1 |
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D1 |
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|
Counter |
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|
Load |
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LBO |
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ADV |
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CK |
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ADSC |
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||||||||||
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|||||||
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||||||||||||||||||
ADSP |
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|||||
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GW |
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Register |
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BW |
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D |
Q |
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BA |
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Register |
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B |
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D |
Q |
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B |
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Register |
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C |
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Q |
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B |
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Register |
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D |
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D |
Q |
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B |
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Register
D Q
Register
E1 D Q
Register
D Q
FT
G
ZZ |
|
Power Down |
SCD |
|
Control |
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Note: Only x36 version shown for simplicity.
A
Memory
Array
Q |
D |
36 |
36 |
4
Parity
Encode
32 |
4
|
Register Q D |
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Register D Q |
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32 |
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36 |
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36 |
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Register |
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D |
Q |
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32 |
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4 |
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32 |
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Register |
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D |
Q |
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Parity |
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||||
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Encode |
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4 |
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Parity |
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Compare |
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32 |
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DQx1–DQx8 |
|
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NC |
|
|
NC |
Rev: 1.00b 12/2002 |
8/33 |
© 2001, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
|
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GS88218/36BB/D-250/225/200/166/150/133 |
|
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Mode Pin Functions |
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|||
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Mode Name |
|
Pin |
State |
Function |
|
|||||||||
|
Name |
|
|||||||||||||
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L |
Linear Burst |
|
|
Burst Order Control |
LBO |
|||||||||||||
|
H |
Interleaved Burst |
|
||||||||||||
|
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L |
Flow Through |
|
|
Output Register Control |
|
FT |
||||||||||||
|
|
|
|
|
|||||||||||
|
|
H or NC |
Pipeline |
|
|||||||||||
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||
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|
|
Power Down Control |
|
ZZ |
L or NC |
Active |
|
|||||||||
|
|
|
|
|
|||||||||||
|
|
H |
Standby, IDD = ISB |
|
|||||||||||
|
|
|
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|
|
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|
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|
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|
||
|
Single/Dual Cycle Deselect Control |
SCD |
L |
Dual Cycle Deselect |
|
||||||||||
|
|
|
|
||||||||||||
|
H or NC |
Single Cycle Deselect |
|
||||||||||||
|
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||
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|
|
Note:
There are pull-up devices on the SCD and FT pins and a pull-down devices on the ZZ pin, so those input pins can be unconnected and the chip will operate in the default states as specified in the above tables.
Enable / Disable Parity I/O Pins
This SRAM allows the user to configure the device to operate in Parity I/O active (x18 or x36) or in Parity I/O inactive (x16, x32, or x64) mode. Holding the PE bump low or letting it float will activate the 9th I/O on each byte of the RAM.
Burst Counter Sequences
Linear Burst Sequence
|
A[1:0] |
A[1:0] |
A[1:0] |
A[1:0] |
|
|
|
|
|
|
|
|
|
|
1st address |
00 |
01 |
10 |
11 |
|
|
|
|
|
2nd address |
01 |
10 |
11 |
00 |
|
|
|
|
|
3rd address |
10 |
11 |
00 |
01 |
|
|
|
|
|
4th address |
11 |
00 |
01 |
10 |
|
|
|
|
|
Note: The burst counter wraps to initial state on the 5th clock.
Interleaved Burst Sequence
|
A[1:0] |
A[1:0] |
A[1:0] |
A[1:0] |
|
|
|
|
|
|
|
|
|
|
1st address |
00 |
01 |
10 |
11 |
|
|
|
|
|
2nd address |
01 |
00 |
11 |
10 |
|
|
|
|
|
3rd address |
10 |
11 |
00 |
01 |
|
|
|
|
|
4th address |
11 |
10 |
01 |
00 |
|
|
|
|
|
Note: The burst counter wraps to initial state on the 5th clock.
BPR 1999.05.18
Rev: 1.00b 12/2002 |
9/33 |
© 2001, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
GS88218/36BB/D-250/225/200/166/150/133
Byte Write Truth Table
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Function |
|
GW |
|
|
BW |
BA |
BB |
|
BC |
|
BD |
Notes |
|||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
Read |
|
H |
|
|
H |
|
X |
|
X |
|
X |
|
X |
1 |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
Read |
|
H |
|
|
L |
|
H |
|
H |
|
H |
|
H |
1 |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
Write byte a |
|
H |
|
|
L |
|
L |
|
H |
|
H |
|
H |
2, 3 |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
Write byte b |
|
H |
|
|
L |
|
H |
|
L |
|
H |
|
H |
2, 3 |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
Write byte c |
|
H |
|
|
L |
|
H |
|
H |
|
L |
|
H |
2, 3, 4 |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
Write byte d |
|
H |
|
|
L |
|
H |
|
H |
|
H |
|
L |
2, 3, 4 |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
Write all bytes |
|
H |
|
|
L |
|
L |
|
L |
|
L |
|
L |
2, 3, 4 |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
Write all bytes |
|
L |
|
|
X |
|
X |
|
X |
|
X |
|
X |
|
|||||
|
|
|
|
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|
|
|
Notes:
1.All byte outputs are active in read cycles regardless of the state of Byte Write Enable inputs.
2.Byte Write Enable inputs BA, BB, BC, and/or BD may be used in any combination with BW to write single or multiple bytes.
3.All byte I/Os remain High-Z during all write operations regardless of the state of Byte Write Enable inputs.
4.Bytes “C” and “D” are only available on the x36 version.
Rev: 1.00b 12/2002 |
10/33 |
© 2001, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.