PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
Pin Name
Type
Pin
No.
Function
RCA
Tristate AB22 The Receive Cell Available (RCA) is an active high
Output
signal that, when polled using the RADR[4:0]
signals, indicates if at least one cell is queued for
transfer on the selected logical channel FIFO .
The S/UNI-IMA-8 device drives RCA with the cell
availability status for the polled port one RCLK cycle
after a valid RADR[4:0] address is sampled. The
RCA output is high-impedance at all other times.
The RCA output is updated on the rising edge of
RCLK.
RENB
Input
W20 The Receive Enable Bar (RENB) is an active low
signal used to initiate the transfer of cells from the
S/UNI-IMA-8 to an ATM-layer component, such as a
traffic management device.
The RENB input is sampled on the rising edge of
RCLK.
RADR[4]
RADR[3]
RADR[2]
RADR[1]
RADR[0]
Input
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 selecting for cell transfer.
Y22
The RADR[4:0] input bus is sampled on the rising
W22
edge of RCLK.
RSOC
Output
V19 The Receive Start of Cell (RSOC) is an active high
signal that marks the first word of the cell on the
RDAT[15:0] bus.
The RSOC output is updated on the rising edge of
RCLK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
19
PMC [ PMC-SIERRA, INC ]
