![](http://datasheet.mmic.net.cn/330000/PM7329-BI_datasheet_16444382/PM7329-BI_47.png)
PM7329 S/UNI-APEX-1K800
DATASHEET
PMC-2010141
ISSUE 2
ATM TRAFFIC MANAGER AND SWITCH
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
33
Pin Name
Type
Pin
No.
Function
WTPA
Input
(Master)
Tri-state
(Slave)
AD21
WAN Transmit Packet Available.
WTPA indicates
cell availability.
This pin is in Hi-Z when the WAN transmit interface
is not enabled.
If master mode is selected, this signal is an input.
The PHY device whose address or address range
matches WTADR[2:0] drives the WTPA signal with
the transmit FIFO availability status of the selected
logical channel N WTCLK cycles after the match. If
the PHY devices are UTOPIA devices, N=1. If the
PHY devices are Any-PHY devices, N=2. Assertion
of WTPA indicates that at least one entire cell buffer
is available in that logical channel.
If slave mode is selected, this signal is a tri-state
output and the S/UNI-APEX-1K800 plays the roll of
a single port UTOPIA L2 slave device driving the
WTPA when the WTADR matches the programmed
WANTxSlaveAddr register. A logical high indicates
that at least one cell is available for transmission.
WTPA is sampled/updated/Hi-Z’d on the rising edge
of WTCLK.
WTENB
Output
(Master)
Input
(Slave)
AC20
WAN Transmit Enable.
WTENB indicates cell
transfers to UTOPIA and SCI-PHY devices. The
device is selected via a match on WTADR[2:0] when
WTENB is last sampled high.
This pin is in Hi-Z when the WAN transmit interface
is not enabled.
If master mode is selected, this signal is an output.
If slave mode is selected, this signal is an input.
WTENB is held low for the duration of the cell
transfer.
WTENB is sampled/updated on the rising edge of
WTCLK.