saa5250 NXP Semiconductors, saa5250 Datasheet - Page 5

• Manufacturer Part Number: saa5250
• Description: Interface For Data Acquisition And Control For Multi-standard Teletext Systems
• Manufacturer: NXP Semiconductors

Philips Semiconductors
PINNING FUNCTION
January 1987
A10 and
A0 to A9
VAL OUT
VAL IN/SYNC
CBB
DCK
SD
MS
WE
DB7 to DB0
ALE
CE
WR
V
RD
D0 to D7
V
MNEMONIC
SS
DD
Interface for data acquisition and control
(for multi-standard teletext systems)
1 and
30 to 39
2
3
4
5
6
7
8
9 to 16
17
18
19
20
21
22 to 29
40
PIN NO.
FUNCTION
Memory address outputs used by CIDAC to address a 2 K byte buffer memory
Validation output signal used to control the location of the window for the framing code.
Validation input signal (line signal) used to give or calculate a window for the framing
code detection
Colour burst blanking output signal used by the SAA5230 as a data slicer reset pulse
Data clock input, in synchronization with the serial data signal
Serial data input, arriving from the demodulator
Chip enable output signal for buffer memory selection
Write command output for the buffer memory
8-bit three state input/output data/address bus used to transfer commands, data and
status between the CIDAC registers and the CPU
Demultiplexing input signal for the CPU data bus
Chip enable input for the SAA5250
Write command input (when LOW)
ground
Read command input (when LOW)
8-bit three state input/output data bus used to transfer data between CIDAC and the
buffer memory
5 V power supply
5
Product specification
SAA5250