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PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
PM7340 S/UNI-IMA-8
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
17
Pin Name
Type
Pin
No.
Function
RADR[4]
RADR[3]
RADR[2]
RADR[1]
RADR[0]
Input
AA22
Y21
V20
Y22
W22
The
Receive Address
(RADR[4:0]) signals are
used to address the S/UNI-IMA-8 device for the
purposes of polling and selection for cell transfer.
The RADR[4:0] signals are valid only when the
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
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.
RSX
Output
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.