31
Agere Systems Inc.
Data Sheet
June 2002
TMXF28155 Supermapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
3 Pin Information
(continued)
Table 15. General-Purpose Interface
Pin
U23
Symbol
DTN
Type
—
I/O
O
Description
Open Drain
Data Transfer Acknowledge.
In synchronous CPU mode,
DTA goes low at the fourth cycle for write or the fifth cycle for
read, resulting in a fixed two wait-states for writes and three
wait-states for reads. In asynchronous
μ
P mode, after qualifi-
cation of AS and DS by TLSC52 clock, DTA goes low for two
TLSC52 clock cycles for writes and three TLSC52 clock
cycles for reads. DTA goes high, along with the rising edge of
AS.
Interrupt.
Supermapper interrupt request, active-low. An
open-drain output should be connected to an external pull-up
resistor.
APS Interrupt.
Automatic protection switch interrupt request,
active-low. An open-drain output should be connected to an
external pull-up resistor.
AB24
INTN
—
O
Open Drain
AC25
APS_INTN
—
O
Open Drain
Pin
T24
Symbol
RSTN
Type
—
I/O
I
Description
Pull-up
I/O
Pull-down
Reset.
Global reset, active-low. Initializes all internal registers
to their default state.
Performance Monitor Reset.
May be configured as an input
and then used to directly reset all the counters associated with
DS1/E1 performance monitoring. If an internal PM reset is
used, PMRST is configured as an output that indicates when a
PM reset occurred.
Test Clock.
This signal provides timing for the boundary scan
and TAP controller. This signal should be static, except during
boundary-scan testing.
Test Data In.
Data input for the boundary scan; sampled on
the rising edge of TCK.
T25
PMRST
—
R5
TCK
—
I
U5
TDI
—
I
Pull-up
I
Pull-up
I
Pull-down
O
W5
TMSN
—
Test Mode Select (Active-Low).
Controls boundary-scan test
operations. TMS is sampled on the rising edge of TCK.
AB8
TRSTN
—
Test Reset (Active-Low).
This signal is an asynchronous
reset for the TAP controller.
V5
TDO
—
Test Data Out.
Updated on the falling edge of TCK. The TDO
output is high impedance, except when scanning out test data.
Global Output Enable.
All output and bidirectional buffers will
be high impedance when this input is low. Normally pulled high
internally.
AB9
IC3STATEN
—
I
Pull-up
Table 14. Microprocessor Interfaces
(continued)