pef22504 Infineon Technologies Corporation, pef22504 Datasheet - Page 38

• Manufacturer Part Number: pef22504
• Description: Quad E1/t1/j1 Line Interface Component For Long- And Short-haul Applications Pef 22504 E, Pef 22504 Ht, Version 2.1
• Manufacturer: Infineon Technologies Corporation

Table 2
Pin No.
88
62
85
84
40
Data Sheet
Name
D0
SCI_TXD
SDO
ALE
RD
DS
WR
RW
DBW
I/O Signals for P-TQFP-144-8 (cont’d)
Pin Type
IO
I
I
I
I
I
I
I
I
Buffer
Type
PU
PP or oD
PU
PU
PU
PU
PU
PU
PU
Function
Data Bus Line 0
SCI Bus Serial Data Out
Only used if SCI interface mode is selected by IM(1:0) = 11
SPI Bus Serial Data Out
Only used if SPI interface mode is selected by IM(1:0) = 10
Address Latch Enable
A high on this line indicates an address on an external
multiplexed address/data bus. The address information
provided on A(9:0) is internally latched with the falling edge
of ALE. This function allows the QuadLIU
to a multiplexed address/data bus without the need for
external latches. In this case, pins A(7:0) must be connected
to the data bus pins externally. In case of demultiplexed
mode this pin can be connected directly to VDD or can be left
open.
Read Enable
Intel bus mode.
This signal indicates a read operation. When the QuadLIU
is selected via CS, the RD signal enables the bus drivers to
output data from an internal register addressed by A(10:0) to
the Data Bus.
Data Strobe
Motorola bus mode.
This pin serves as input to control read/write operations.
Write Enable
Intel bus mode.
This signal indicates a write operation. When CS is active the
QuadLIU
the data bus.
Read/Write Select
Motorola bus mode.
This signal distinguishes between read and write operation.
Data Bus Width select
Bus interface mode
A low signal on this input selects the 8-bit bus interface
mode. A high signal on this input selects the 16-bit bus
interface mode. In this case word transfer to/from the internal
registers is enabled. Byte transfers are implemented by using
A0 and BHE/BLE.
38
TM
loads an internal register with data provided on
Rev. 1.3, 2006-01-25
TM
Pin Descriptions
to be connected
QuadLIU
PEF 22504
TM
TM
B
B
.
.