Preliminary
GS840FH18/32/36AT-8/8.5/10/12
TQFP |
256K x 18, 128K x 32, 128K x 36 |
8 ns–12 ns |
Commercial Temp |
4Mb Sync Burst SRAMs |
3.3 V VDD |
Industrial Temp |
3.3 V and 2.5 V I/O |
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•Flow Through mode operation
•3.3 V +10%/–5% 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 Interleaved Pipeline mode
•Byte Write (BW) and/or Global Write (GW) operation
•Common data inputs and data outputs
•Clock Control, registered, address, data, and control
•Internal self-timed write cycle
•Automatic power-down for portable applications
•JEDEC-standard 100-lead TQFP
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-8 |
-8.5 |
-10 |
-12 |
Unit |
Flow |
tKQ |
8 |
8.5 |
10 |
12 |
ns |
Through |
tCycle |
9.1 |
10 |
10 |
15 |
ns |
2-1-1-1 |
IDD |
115 |
105 |
105 |
80 |
mA |
The JEDEC standard for Burst RAMs calls for a FT mode pin option (Pin 14 on TQFP). Board sites for flow through Burst RAMs should be designed with VSS connected to the FT pin
location to ensure the broadest access to multiple vendor sources. Boards designed with FT pin pads tied low may be stuffed with GSI’s pipeline/flow through-configurable Burst RAMs or any vendor’s flow through or configurable Burst SRAM. Bumps designed with the FT pin location tied high or floating must employ a non-configurable flow through Burst RAM, (e.g., GS840FH18/32/36A), to achieve flow through functionality.
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.
The GS840FH18/32/36A is a 4,718,592-bit (4,194,304-bit for x32 version) 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. The GS840FH18/32/36A is available in a JEDEC-standard 100-lead TQFP package.
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.
The GS840FH18/32/36A operates on a 3.3 V power supply and all inputs/outputs are 3.3 V- and 2.5 V-compatible. Separate output power (VDDQ) pins are used to decouple
output noise from the internal circuit.
Addresses, data I/Os, chip enables (E1, E2, E3), 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 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.
Rev: 1.05 7/2002 |
1/22 |
© 1999, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Preliminary
GS840FH18/32/36AT-8/8.5/10/12
NC
NC
NC
VDDQ
VSS
NC
NC
DQB1
DQB2
VSS
VDDQ
DQB3
DQB4
NC
VDD
NC
VSS
DQB5
DQB6
VDDQ
VSS
DQB7
DQB8
DQB9
NC
VSS
VDDQ
NC
NC
NC
|
A6 |
A7 |
E1 |
E2 |
NC |
NC |
BB BA E3 |
V |
V |
CK GW BW |
G |
ADSC |
ADSP |
ADV A8 |
A9 |
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100 |
99 |
98 |
97 |
96 |
95 |
94 |
93 |
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92 |
91 |
90 |
89 |
88 |
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87 |
86 |
85 |
84 |
83 |
82 |
81 |
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1 |
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80 |
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2 |
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79 |
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3 |
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78 |
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4 |
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77 |
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5 |
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76 |
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6 |
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75 |
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7 |
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74 |
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8 |
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73 |
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9 |
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256K x 18 |
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72 |
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10 |
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71 |
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Top View |
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11 |
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70 |
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12 |
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69 |
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13 |
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68 |
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14 |
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67 |
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15 |
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66 |
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16 |
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65 |
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17 |
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64 |
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18 |
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63 |
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19 |
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62 |
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20 |
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61 |
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21 |
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60 |
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22 |
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59 |
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23 |
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58 |
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24 |
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57 |
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25 |
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56 |
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26 |
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55 |
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27 |
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54 |
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28 |
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53 |
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29 |
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52 |
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30 |
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51 |
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|||||
31 |
32 |
33 |
34 |
35 |
36 |
37 |
38 |
|
39 |
40 |
41 |
42 |
43 |
|
44 |
45 |
46 |
47 |
48 |
49 |
50 |
|
|
||||||||||||||||||||||||||||||||||||||
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|
LBO A5 |
A4 |
A3 |
A2 |
A1 |
A0 |
NC NC |
|
SS |
|
DD |
NC NC A10 |
A11 |
A12 |
A13 |
A14 |
A15 |
A16 |
|
|
||||||||||||||||||||||||||||||||||||||||
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|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
V |
V |
|
|
A17
NC
NC
VDDQ
VSS
NC
DQA9
DQA8
DQA7
VSS
VDDQ
DQA6
DQA5
VSS
NC
VDD
ZZ
DQA4
DQA3
VDDQ
VSS
DQA2
DQA1
NC
NC
VSS
VDDQ
NC
NC
NC
Rev: 1.05 7/2002 |
2/22 |
© 1999, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com |
. |
Preliminary
GS840FH18/32/36AT-8/8.5/10/12
NC
DQC8
DQC7
VDDQ
VSS
DQC6
DQC5
DQC4
DQC3
VSS
VDDQ
DQC2
DQC1
NC
VDD
NC
VSS
DQD1
DQD2
VDDQ
VSS
DQD3
DQD4
DQD5
DQD6
VSS
VDDQ
DQD7
DQD8
NC
|
A6 |
A7 |
E1 |
E2 |
BD BC BB BA E3 |
V |
V |
CK GW BW |
G |
ADSC |
ADSP |
ADV A8 |
A9 |
|
|
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DD |
|
SS |
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|
|
|
|
|
|
100 |
99 |
98 |
97 |
96 |
95 |
94 |
93 |
|
92 |
91 |
90 |
89 |
88 |
|
87 |
86 |
85 |
84 |
83 |
82 |
81 |
|
|
||||||||||||||||||||||||||||||||||||||
1 |
|
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|
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|
80 |
|
|
|||
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|||||
2 |
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|
79 |
|
|
|||
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|||||
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|||||
3 |
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|
78 |
|
|
|||
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|||||
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|||||
4 |
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|
77 |
|
|
|||
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|||||
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|||||
5 |
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76 |
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|||
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|||||
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|||||
6 |
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75 |
|
|
|||
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|||||
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|||||
7 |
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74 |
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|
|||
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|||||
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|||||
8 |
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73 |
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|||
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|||||
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|||||
9 |
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|
128K x 32 |
|
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72 |
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|
||||||||||||||||
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|||||||||||||||||||
10 |
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71 |
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|||||||||||||||||
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|||||||||||||||||||
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Top View |
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||||||||||||||||||
11 |
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70 |
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||||||||||||||||
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||||||||||||||||||
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||||||||||||||||||
12 |
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69 |
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|||
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13 |
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68 |
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14 |
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67 |
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15 |
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66 |
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16 |
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65 |
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17 |
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64 |
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18 |
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63 |
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19 |
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62 |
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20 |
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61 |
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21 |
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60 |
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22 |
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59 |
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23 |
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58 |
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24 |
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57 |
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25 |
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56 |
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26 |
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55 |
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27 |
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54 |
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28 |
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53 |
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29 |
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52 |
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30 |
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51 |
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|||||
31 |
32 |
33 |
34 |
35 |
36 |
37 |
38 |
|
39 |
40 |
41 |
42 |
43 |
|
44 |
45 |
46 |
47 |
48 |
49 |
50 |
|
|
||||||||||||||||||||||||||||||||||||||
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|
LBO A5 |
A4 |
A3 |
A2 |
A1 |
A0 |
NC NC |
|
SS |
|
DD |
NC NC A10 |
A11 |
A12 |
A13 |
A14 |
A15 |
A16 |
|
|
||||||||||||||||||||||||||||||||||||||||
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||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
V |
V |
|
|
NC
DQB8
DQB7
VDDQ
VSS
DQB6
DQB5
DQB4
DQB3
VSS
VDDQ
DQB2
DQB1
VSS
NC
VDD
ZZ
DQA1
DQA2
VDDQ
VSS
DQA3
DQA4
DQA5
DQA6
VSS
VDDQ
DQA7
DQA8
NC
Rev: 1.05 7/2002 |
3/22 |
© 1999, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com |
. |
Preliminary
GS840FH18/32/36AT-8/8.5/10/12
DQC9
DQC8
DQC7
VDDQ
VSS
DQC6
DQC5
DQC4
DQC3
VSS
VDDQ
DQC2
DQC1
NC
VDD
NC
VSS
DQD1
DQD2
VDDQ
VSS
DQD3
DQD4
DQD5
DQD6
VSS
VDDQ
DQD7
DQD8
DQD9
|
A6 |
A7 |
E1 |
E2 |
BD BC BB BA E3 |
V |
V |
CK GW BW |
G |
ADSC |
ADSP |
ADV A8 |
A9 |
|
|
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DD |
|
SS |
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|
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|
|
|
|
|
|
|
|
100 |
99 |
98 |
97 |
96 |
95 |
94 |
93 |
|
92 |
91 |
90 |
89 |
88 |
|
87 |
86 |
85 |
84 |
83 |
82 |
81 |
|
|
||||||||||||||||||||||||||||||||||||||
1 |
|
|
|
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|
|
|
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|
|
80 |
|
|
|||
|
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|||||
2 |
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|
79 |
|
|
|||
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|||||
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|||||
3 |
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|
78 |
|
|
|||
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|||||
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|||||
4 |
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|
77 |
|
|
|||
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|||||
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|||||
5 |
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76 |
|
|
|||
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|||||
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|||||
6 |
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|
75 |
|
|
|||
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|||||
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|||||
7 |
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74 |
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|
|||
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|||||
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|||||
8 |
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73 |
|
|
|||
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|||||
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|||||
9 |
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|
128K x 36 |
|
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72 |
|
|
||||||||||||||||
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|||||||||||||||||||
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|||||||||||||||||||
10 |
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71 |
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|
|||||||||||||||||
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|||||||||||||||||||
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Top View |
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|||||||||||||||||
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||||||||||||||||||
11 |
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70 |
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|
||||||||||||||||
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||||||||||||||||||
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||||||||||||||||||
12 |
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69 |
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|||
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|||||
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13 |
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68 |
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14 |
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67 |
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15 |
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66 |
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16 |
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65 |
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17 |
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64 |
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18 |
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63 |
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19 |
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62 |
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20 |
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61 |
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21 |
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60 |
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22 |
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59 |
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23 |
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58 |
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24 |
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57 |
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25 |
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56 |
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26 |
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55 |
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27 |
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54 |
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28 |
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53 |
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29 |
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52 |
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30 |
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51 |
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31 |
32 |
33 |
34 |
35 |
36 |
37 |
38 |
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39 |
40 |
41 |
42 |
43 |
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44 |
45 |
46 |
47 |
48 |
49 |
50 |
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LBO A5 |
A4 |
A3 |
A2 |
A1 |
A0 |
NC NC |
|
SS |
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DD |
NC NC A10 |
A11 |
A12 |
A13 |
A14 |
A15 |
A16 |
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V |
V |
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DQB9
DQB8
DQB7
VDDQ
VSS
DQB6
DQB5
DQB4
DQB3
VSS
VDDQ
DQB2
DQB1
VSS
NC
VDD
ZZ
DQA1
DQA2
VDDQ
VSS
DQA3
DQA4
DQA5
DQA6
VSS
VDDQ
DQA7
DQA8
DQA9
Rev: 1.05 7/2002 |
4/22 |
© 1999, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com |
. |
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Preliminary |
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GS840FH18/32/36AT-8/8.5/10/12 |
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TQFP Pin Description |
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Pin Location |
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Symbol |
Type |
Description |
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37, 36 |
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A0, A1 |
I |
Address field LSBs and Address Counter preset Inputs |
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35, 34, 33, 32, 100, 99, 82, 81,44, 45, 46, |
|
A2–A16 |
I |
Address Inputs |
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47, 48, 49, 50 |
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80 |
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A17 |
I |
Address Inputs (x18 versions) |
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52, 53, 56, 57, 58, 59, 62, 63 |
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DQA1–DQA8 |
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68, 69, 72, 73, 74, 75, 78, 79 |
|
DQB1–DQB8 |
I/O |
Data Input and Output pins. (x32, x36 Version) |
||||||||||||||||||||||||
|
2, 3, 6, 7, 8, 9, 12, 13 |
|
DQC1–DQC8 |
||||||||||||||||||||||||||
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18, 19, 22, 23, 24, 25, 28, 29 |
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DQD1–DQD8 |
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51, 80, 1, 30 |
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DQA9, DQB9, |
I/O |
Data Input and Output pins. (x36 Version) |
||||||||||||||||||||||
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DQC9, DQD9 |
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51, 80, 1, 30 |
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NC |
— |
No Connect (x32 Version) |
|||||||||||||||||
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58, 59, 62, 63, 68, 69, 72, 73, 74 |
|
DQA1–DQA9 |
I/O |
Data Input and Output pins. (x18 Version) |
||||||||||||||||||||||||
|
8, 9, 12, 13, 18, 19, 22, 23, 24 |
DQB1-–DQB98 |
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51, 52, 53, 56, 57 |
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75, 78, 79 |
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NC |
— |
No Connect (x18 Version) |
||||||||||||||||
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1, 2, 3, 6, 7 |
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25, 28, 29, 30 |
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87 |
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I |
Byte Write—Writes all enabled bytes; active low |
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BW |
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93, 94 |
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A, |
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B |
I |
Byte Write Enable for DQA, DQB Data I/O’s; active low |
|||||||||
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B |
B |
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Byte Write Enable for DQC, DQD Data I/O’s; active low |
|
95, 96 |
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BC, BD |
I |
||||||||||||||||||||
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(x32, x36 Version) |
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95, 96 |
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NC |
— |
No Connect (x18 Version) |
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89 |
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CK |
I |
Clock Input Signal; active high |
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88 |
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I |
Global Write Enable—Writes all bytes; active low |
|||
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GW |
|||||||||||||||||||
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98, 92 |
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1, |
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3 |
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I |
Chip Enable; active low |
||||||
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E |
E |
||||||||||||||||||||
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97 |
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E2 |
I |
Chip Enable; active high |
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86 |
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I |
Output Enable; active low |
|||||
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G |
||||||||||||||||
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83 |
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I |
Burst address counter advance enable; active low |
||
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ADV |
||||||||||||||||||||
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84, 85 |
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I |
Address Strobe (Processor, Cache Controller); active low |
||
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ADSP, |
ADSC |
||||||||||||||||||||||
|
64 |
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ZZ |
I |
Sleep Mode control; active high |
|||||||||||||
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31 |
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I |
Linear Burst Order mode; active low |
||||
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LBO |
||||||||||||||||||||
|
15, 41, 65, 91 |
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VDD |
I |
Core power supply |
||||||||||||||||||
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||||||||||||||||||||
|
5,10,17, 21, 26, 40, 55, 60, 67, 71, 76, 90 |
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VSS |
I |
I/O and Core Ground |
||||||||||||||||||||
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||||||||||||||||||||||
|
4, 11, 20, 27, 54, 61, 70, 77 |
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VDDQ |
I |
Output driver power supply |
||||||||||||||||||||||
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|||||||||||||||||||
|
14, 16, 38, 39, 42, 43, 66 |
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NC |
— |
No Connect |
|||||||||||||||||||
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|
Rev: 1.05 7/2002 |
5/22 |
© 1999, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com |
. |
Preliminary
GS840FH18/32/36AT-8/8.5/10/12
A0–An |
Register |
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D |
Q |
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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
ADV
CK
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ADSC |
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ADSP |
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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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B |
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1 |
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Q |
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E3 |
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Register
D Q
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A |
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Memory |
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Array |
Q |
D |
36 |
36 |
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4 |
Register Q D |
Register D Q |
0 |
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G |
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1 |
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ZZ |
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Power Down |
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DQx0–DQx9 |
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Control |
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Note: Only x36 version shown for simplicity.
Rev: 1.05 7/2002 |
6/22 |
© 1999, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com |
. |
Preliminary
GS840FH18/32/36AT-8/8.5/10/12
Mode Pin Functions
Mode Name |
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Pin |
State |
Function |
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Name |
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L |
Linear Burst |
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Burst Order Control |
LBO |
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H or NC |
Interleaved Burst |
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L |
Flow Through |
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Output Register Control |
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FT |
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H or NC |
Pipeline |
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Power Down Control |
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ZZ |
L or NC |
Active |
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H |
Standby, IDD = ISB |
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Note:
There is a are pull-up devices on the LBO and FT pins and a pull down device 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.
Linear Burst Sequence
|
A[1:0] |
A[1:0] |
A[1:0] |
A[1:0] |
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1st address |
00 |
01 |
10 |
11 |
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2nd address |
01 |
10 |
11 |
00 |
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3rd address |
10 |
11 |
00 |
01 |
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4th address |
11 |
00 |
01 |
10 |
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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] |
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1st address |
00 |
01 |
10 |
11 |
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2nd address |
01 |
00 |
11 |
10 |
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3rd address |
10 |
11 |
00 |
01 |
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4th address |
11 |
10 |
01 |
00 |
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Note: The burst counter wraps to initial state on the 5th clock.
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Function |
|
GW |
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BW |
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BA |
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BB |
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BC |
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BD |
Notes |
|||||
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|||||
Read |
|
H |
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H |
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X |
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X |
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X |
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X |
1 |
|||||
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|||||
Read |
|
H |
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L |
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H |
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H |
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H |
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H |
1 |
|||||
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|||||
Write byte A |
|
H |
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L |
|
L |
|
H |
|
H |
|
H |
2, 3 |
|||||
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|||||
Write byte B |
|
H |
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L |
|
H |
|
L |
|
H |
|
H |
2, 3 |
|||||
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|||||
Write byte C |
|
H |
|
|
L |
|
H |
|
H |
|
L |
|
H |
2, 3, 4 |
|||||
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|||||
Write byte D |
|
H |
|
|
L |
|
H |
|
H |
|
H |
|
L |
2, 3, 4 |
|||||
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|
|||||
Write all bytes |
|
H |
|
|
L |
|
L |
|
L |
|
L |
|
L |
2, 3, 4 |
|||||
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|
|||||
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/O’s 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 x32 and x36 versions.
Rev: 1.05 7/2002 |
7/22 |
© 1999, Giga Semiconductor, Inc. |
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com |
. |