PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 229

• Manufacturer Part Number: PM5366-PI
• Description: HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
• Manufacturer: PMC-Sierra, Inc.

PRELIMINARY
DATASHEET
PMC-2010672
13.4.1 Notes on 77.76 MHz Telecom Bus Operation
PROPRIETARY AND CONFIDENTIAL
LADATA[7:0]
LREFCLK
LAC1J1V1
Figure 57
Telecom bus operation at 77.76MHz is simply a byte interleaved multiplex of a
19.44 MByte/s stream with idle cycles. The STM-1 of interest is identified by the
LSTM[1:0] bits of the Master Bus Configuration register. On the Drop bus, the
three unused STM-1s are simply ignored, including parity. On the Add bus, the
unused STM-1s are high-impedance by default, but the bus may be configured
to drive continuously. The following is of special note:
LAC1
LAOE
LAPL
First R column of TUG3 #1
1. Regardless of the state of the LSTM[1:0] bits, the LAC1 input pulse
2. The LAC1J1V1 output is only valid if the LSTM[1:0] bit are “00”. The C1
Implicit location
of VC4 J1 byte
National
bytes
always identifies the first of the twelve C1 bytes.
indication will identify the first of the twelve C1 bytes. The J1 will be high
during either the first J1 byte or the first three J1 bytes depending on
whether AU3 or AU4 mode is programmed. The same is true of the V1
pulse. If more than one device is driving the bus, all devices must use the
same transmit payload pointer.
V1 byte TU #1, TUG2 #1, TUG3 #1
A2 C1 X X
- Telecom ADD Bus Timing - Locked AU4 VC Case
J1
ISSUE 1
R R R R R R
V1
217
Last H4 byte
in tributary
multiframe
••••
H4
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
Fixed
Stuff
Columns
V5 byte TU #1,
TUG2 #1, TUG3 #1
R R R R R R
Z6 byte TU #1,
TUG2 #1, TUG3 #3
AND M13 MULTIPLEXER
PM5366 TEMAP-84
V5
Z6