TXC-04252AIPQ Transwitch Corporation, TXC-04252AIPQ Datasheet - Page 14

• Manufacturer Part Number: TXC-04252AIPQ
• Manufacturer: Transwitch Corporation

Specifications of TXC-04252AIPQ

• Pin Count: 160
• Screening Level: Industrial
• Package Type: PQFP
• Lead Free Status / Rohs Status: Not Compliant

BDC1J1V1
Ed. 3, December 2000
QE1M
TXC-04252
TXC-04252-MB
B DROP AND B ADD BUS I/O
Symbol
BD(7-0)
BDSPE
BDCLK
BDPAR
BDIND
160-Lead
Lead No.
90-87,
PQFP
85-82
101
99
91
93
94
Proprietary TranSwitch Corporation Information for use Solely by its Customers.
M16, M15,
N13, N16,
208-Lead
P16, P15,
Lead No.
R16, P14
PBGA
M14
K14
L15
L16
J14
I/O/P
O
I
I
I
I
I
DATA SHEET
CMOS
Type
4mA
TTL
TTL
TTL
TTL
TTL
- 14 of 148 -
B Drop Bus Clock: This clock operates at 19.44 MHz for
STM-1/STS-3 operation, and at 6.48 MHz for STS-1 opera-
tion. B Drop bus byte-wide data (BD7-BD0), the parity bit
(BDPAR), SPE indication (BDSPE), and the C1J1V1 indica-
tion (BDC1J1V1) are clocked in on falling edges of this
clock. This clock may also be used for timing and deriving
the like-named add bus byte-wide data, add and TU/VT indi-
cations, and parity bits. The add bus signals are clocked out
on rising edges of the clock during the time slots that corre-
spond to the selected TU/VT.
B Drop Bus Parity Bit: An odd parity bit input signal repre-
senting the parity calculation for each data byte, SPE, and
C1J1V1 signal from the drop bus. Control bits are provided
in address 012H which enable parity to be calculated as
even (control bit DPE is 1), and/or for the data byte only
(control bit PDDO is 1).
B Drop Bus Data Byte: Byte-wide data that corresponds to
the STM-1/STS-3/STS-1 signal from the drop bus. The first
bit received (dropped) corresponds to bit 7.
B Drop Bus SPE Indicator: A signal that is active high dur-
ing each byte of the STM-1/STS-3/STS-1 payload, and low
during Transport Overhead times.
B Drop Bus C1J1V1 Indications: An active high timing sig-
nal that carries STM-1/STS-3/STS-1 starting frame and SPE
information. This signal works in conjunction with the
BDSPE signal. The C1 pulse identifies the location of the
first C1 byte in the STM-1/STS-3 signal, and the C1 byte in
the STS-1 signal, when BDSPE is low. The J1 signal identi-
fies the starting location of the J1 signal when BDSPE is
high. One or more V1 pulses may be present depending
upon the format. The V1 pulses may be used in place of the
H4 byte as the multiframe indication.
B Drop Bus TU/VT Selection Indication: Enabled when
control bit BDnEN is written with a 1. An active low signal
that is clocked out for the time slots determined by TU/VT
selection (RTUNn register) for each port (n=port number,
1-4).
Name/Function