RELEASED
PM7350 S/UNI DUPLEX
DATA SHEET
PMC-1980581
ISSUE 8
DUAL SERIAL LINK PHY MULTIPLEXER
Ball
Name
Ball
No. Function
Type
High Speed LVDS Links
IENB
I/O
B4 The active low input port enable (IENB) signal is
used to initiate the reading of cells from a PHY
device into the upstream cell buffer.
As a SCI-PHY/Utopia bus master (IMASTER = 1,
IANYPHY = 0) the S/UNI-DUPLEX asserts IENB to
transfer a cell from one of up to 32 PHY devices.
The source PHY is selected by the IADDR[4:0]
signals. A valid word is expected on the IDAT[15:0]
bus at the second rising edge of IFCLK after the
enable is asserted.
As a bus slave (IMASTER = 0) IENB is an input and
a IDAT[15:0] word is accepted coincident with IENB
being sampled low.
As an Any-PHY bus slave (IMASTER = 0, IANYPHY
= 1) IENB is ignored if ISX is high and may be held
low upon the completion of a cell transfer, since a
cell transfer is only initiated by assertion of ISX.
IENB may be deasserted high at any time to pause
a cell transfer.IENB is sampled or updated on the
rising edge of IFCLK.
The Any-PHY protocol supports autonomous
deselection. As an Any-PHY slave the inputs
become high impedance after the last word of a cell
is transferred until the S/UNI-DUPLEX is reselected
(via ISX) even if IENB is left asserted. As a SCI-
PHY/Utopia slave ISX is not defined, so a
subsequent cell is transferred (provided one is
available) if IENB is held low beyond the end of a
cell.
This signal is only active if the SCIANY input is a
logic high.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
27
PMC [ PMC-SIERRA, INC ]
