S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
Pin Name Type
Pin
No.
Function
The Receive Cell Data (RDAT[15:0]) signals carry the ATM cell
words that have been read from the S/UNI-IMA-4 internal cell
buffers. When this interface is operating in 8-bit mode, the data is
carried on RDAT[7:0].
RDAT[15]
RDAT[14]
RDAT[13]
RDAT[12]
RDAT[11]
RDAT[10]
RDAT[9]
RDAT[8]
RDAT[7]
RDAT[6]
RDAT[5]
RDAT[4]
RDAT[3]
RDAT[2]
RDAT[1]
RDAT[0]
Tristate
Output
U22
T22
U19
R20
R22
T19
R19
P20
P21
P22
P19
N20
N21
N22
N19
M20
The RDAT[15:0] output bus is updated on the rising edge of RCLK.
The Receive Parity (RPRTY) signal provides the parity
(programmable for odd or even parity) of the RDAT[15:0] bus. When
the interface is operating in 8-bit mode, the parity is calculated over
RDAT[7:0]
RPRTY
Tristate
Output
M22
The RPRTY output is updated on the rising edge of RCLK.
9.2 Receive Slave ATM Interface (UTOPIA L2 mode) (26 Signals)
Pin Name Type
Pin
Function
No.
The Receive Clock (RCLK) signal is used to transfer data blocks
RCLK
Input
T21
from the S/UNI-IMA-4 across the receive UTOPIA L2 interface.
The RCA, RSOC, RDAT[15:0], and RPRTY outputs are updated on
the rising edge of RCLK. The RENB and RADR[4:0] inputs are
sampled on the rising edge of RCLK.
The RCLK input must cycle at a 52 MHz or lower instantaneous
rate.
The Receive Cell Available (RCA) is an active high 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-4 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.
RCA
Tristate
Output
AB22
W20
The RCA output is updated on the rising edge of RCLK.
The Receive Enable Bar (RENB) is an active low signal used to
initiate the transfer of cells from the S/UNI-IMA-4 to an ATM-layer
component, such as a traffic management device.
RENB
Input
Input
The RENB input is sampled on the rising edge of RCLK.
The Receive Address (RADR[4:0]) signals are used to address the
S/UNI-IMA-4 device for the purposes of polling and selecting for cell
transfer.
RADR[4]
RADR[3]
RADR[2]
RADR[1]
RADR[0]
AA22
Y21
V20
Y22
The RADR[4:0] input bus is sampled on the rising edge of RCLK.
W22
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
31
PMC [ PMC-SIERRA, INC ]
