RELEASED
PM7351 S/UNI-VORTEX
DATA SHEET
PMC-1980582
ISSUE 5
OCTAL SERIAL LINK MULTIPLEXER
Ball
Ball
Type No. Function
Name
RENB
Input A19 The active low read enable (RENB) output is used to
initiate the transfer of cells from the S/UNI-VORTEX to
a traffic management device.
When RENB is sampled low and the S/UNI-VORTEX
has been selected, a word is output on bus
RDAT[15:0]. Selection occurs when RENB is last
sampled high if the RADR[4:0] value equals the state
of VADR[4:0]. RENB must be low for between 27 and
29 cycles to transfer an entire cell depending on
whether the cell contains prepended words or the
H5/UDF word.
If RANYPHY is logic low, valid data is driven
immediately upon sampling RENB low. If RANYPHY
is logic high, the RSX, RSOP, RDAT[15:0] and RPRTY
outputs have an additional cycle of latency.
It is permissible to pause a cell transfer by deasserting
RENB high. If RANYPHY is logic low, the S/UNI-
VORTEX’s address must be presented on RADR[4:0]
the last cycle RENB is high to reselect the device. If
RANYPHY is logic high, the cell transfer resumes
unconditionally when RENB is asserted low again. In
either case, a cell transfer must be completed before
another device on the bus is selected.
The Any-PHY protocol supports autonomous
deselection. If RANYPHY is logic high, the outputs
become high impedance after the last word of a cell is
transferred until the S/UNI-VORTEX is reselected. If
RANYPHY is logic low, a subsequent cell is
transferred (provided one is available) if RENB is held
low beyond the end of a cell.
When RENB is sampled high or the S/UNI-VORTEX
is not selected, no read is performed and outputs
RDAT[15:0], RPRTY, RSX and RSOP become high
impedance.
The RENB input is sampled on the rising edge of
RCLK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
16
PMC [ PMC-SIERRA, INC ]
