XRT94L43
144
REV. 1.0.2
SONET/SDH OC-12 TO 12XDS3/E3 MAPPER
PIN DESCRIPTIONS - INDIRECT ADDRESSING
MICROPROCESSOR INTERFACE
PIN #
SIGNAL NAME
I/O
SIGNAL
TYPE
DESCRIPTION
U22
PCLK
I
TTL
Microprocessor Interface Clock Input:
This clock input signal is used for synchronous/burst/DMA data transfer
operations. This clock can be running up to 66MHz.
L25
L23
L22
PTYPE_0
PTYPE_1
PTYPE_2
I
TTL
Microprocessor Type Select input:
These three input pins are used to configure the Microprocessor Interface
block to readily support a wide variety of Microprocessor Interfaces. The
relationship between the settings of these input pins and the corresponding
Microprocessor Interface configuration is presented below.
PTYPE[2:0]
Microprocessor Interface Mode
000
Asynchronous Intel
l001
Asynchronous Motorola
010
Intel X86
011
Intel I960, Motorola MPC860
100
IDT3051/52 (MIPS)
101
IBM Power PC
V26
R24
P26
M24
T26
M22
M25
L26
PADDR_0
PADDR_1
PADDR_2
PADDR_3
PADDR_4
PADDR_5
PADDR_6
PADDR_7
I
TTL
Address Bus Input pins (Microprocessor Interface):
These pins are used to select the on-chip Mapper/Framer registers and
RAM space for READ and WRITE Operations with the Microprocessor.
T22
R22
U24
R21
W26
T25
R25
R26
PDATA_0
PDATA_1
PDATA_2
PDATA_3
PDATA_4
PDATA_5
PDATA_6
PDATA_7
I/O
TTL
Bi-Directional Data Bus Pins (Microprocessor Interface):
These pins are used to drive and receive data over the bi-directional data
bus.
Y26
PWR_L
I
TTL
Write Strobe (Intel Mode):
If the Microprocessor Interface is configured to operate in the Intel Mode,
then this active-low input pin functions as the WR (WRITE Strobe) input sig-
nal from the Microprocessor. Once this active-low signal is asserted, the
Mapper/Framer will latch the contents of the bi-directional data (D[7:0]) into
the addressed registers (or Buffer location) within the Mapper/Framer.
R/W Input Pin (Motorola Mode):
When the Microprocessor Interface Section is operating in the Motorola
Mode, then this pin is functionally equivalent to the R/W pin. In the Motorola
Mode, a READ operation occurs if this pin is at a logic 1. Similarly a WRITE
operation occurs if this pin is at a logic 0.