PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
Pin Name
Type
Input
Pin
No.
Function
RADR[4]
RADR[3]
RADR[2]
RADR[1]
RADR[0]
AA22 The Receive Address (RADR[4:0]) signals are
Y21 used to address the S/UNI-IMA-8 device for the
V20 purposes of polling and selection for cell transfer.
Y22 The RADR[4:0] signals are valid only when the
W22 RCSB signal is sampled active in the following
RCLK cycle.
The RADR[4:0] input bus is sampled on the rising
edge of RCLK.
RCSB
Input
U21 The Receive Chip Select (RCSB) is an active low
signal that is used to select the S/UNI-IMA-8 receive
interface. When the RCSB is sampled low, it
indicates that the RADR[4:0] sampled at the
previous clock is a valid address. If the RCSB is
sampled high, the device is not selected and the
RADR[4:0] sampled on the previous cycle is not a
valid address and is ignored. When sufficient
address space is provided by RADR[4:0] for all
devices on the bus, this signal may be tied low.
The RCSB input is sampled on the rising edge of
RCLK.
RSOP
RSX
Output
Output
V19 The Receive Start of Packet (RSOP) is an active
high signal that marks the start of the cell on the
RDAT[15:0] bus. When RSOP is active, the first
word of the cell is present on the RDAT[15:0] bus.
The RSOP output is updated on the rising edge of
RCLK.
T20 The Receive Start of Transfer (RSX) signal is an
active high signal that marks the first cycle of a data
block transfer on the RDAT[15:0] bus. When the
RSX signal is active, the coinciding data on the
RDAT[15:0] bus represents the in-band PHY
address.
The RSX output is updated on the rising edge of
RCLK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
17
PMC [ PMC-SIERRA, INC ]
