ZILOG Z86251 Datasheet
FEATURES
C
USTOMER
P
ROCUREMENT SPECIFICATION
Z86251
STARSIGHT DATABASE ENGINE
Z86251
CP96TEL1900
■ Part Package Speed (MHz)
Z86251 68-Pin PLCC 24
■ 4.5- to 5.5-Volt Operating Range
■ 0°C to +70°C Temperature Range
■ Low-Power Consumption
■ Segmented Base Registers
■ DRAM Memory Control and Refresh Logic
GENERAL DESCRIPTION
Zilog's Z86251 StarSight Data Base Engine (DBE) is
designed to process extracted data for the StarSight
on-screen programming guide.
The Z86251 provides a number of important peripheral
functions, such as the IR Blaster to send command signals
to the VCR, and low-power management to avoid loss of
data.
■ Power-Down DRAM Data Retention
■ Infrared Transmitter Circuits for TV and VCR Control
■ CRC-32 Encoding and Decoding Logic
■ Watch-Dog Timer (WDT) for Error Recovery
■ I2C Compatible Bus for External Communication
■ Test Multiplexer for Chip Debug
■ On-Chip Crystal Oscillator
For fast memory data manipulation, the Z86251 offers
segmented base registers. The device also features
DRAM memory control and refresh logic.
The DBE is optimized to work with Zilog's Z89300 series of
TV controller devices to provide a cost-effective solution
for StarSight programming-guide data extraction and
display.
CP96TEL1900 (8/96)
Notes:
All Signals with a preceding front slash, "/", are active Low,
e.g.: B//W (WORD is active Low); /B/W (BYTE is active Low,
only).
Power connections follow conventional descriptions below:
Connection Circuit Device
Power V
Ground GND V
CC
V
DD
SS
1
PIN DESCRIPTION
Z86251
CP96TEL1900
P AD0
P AD1
P AD2
P AD3
P AD4
P AD5
P AD6
P AD7
GND2
VDD2
P XWR
P XRD
P ALE
P XPSEN
10
11
12
13
14
15
16
17
18
19
20
21
22
23
PRDATA0
PRDATA1
PRDATA3
PRDATA2
789 6543216867666564636261
PXWE
PXRAS
PXCAS
GND1
VDD1
PED A9
PED A8
PED A6
PED A7
PED A5
PED A4
Z86251
68-Pin
PLCC
PED A2
PED A3
60
59
58
57
56
55
54
53
52
51
50
49
48
47
PED A1
PED A0
PLPOSC2
PLPOSC1
PIO7
PIO6
PIO4
VDD4
GND4
PIO3
PIO2
PIO1
PIO0
PISB DTA
POSC 2
P A15
P A14
24
25
26
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
P A9
P A13
P A12
P A1 1
P A10
P A8
PXISBINT
PBAND2 I
Z86251 68-Pin PLCC
Pin Assignments
VDD3
GND3
PUPRESET
P DRAM EN
PIO5
PXTAL1
P6805CLK
PXTAL2
PIR XCLK
46
45
44
PISB CLK
P XRESET
PXLPWARN
2
PIN DESCRIPTION (Continued)
Z86251
CP96TEL1900
Z86251 Pinouts
3
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