![](http://datasheet.mmic.net.cn/330000/PM7351_datasheet_16444401/PM7351_26.png)
RELEASED
PM7351 S/UNI-VORTEX
DATA SHEET
PMC-1980582
ISSUE 5
OCTAL SERIAL LINK MULTIPLEXER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
16
Ball
Name
Type
Ball
No.
Function
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.