tmxf28155 ETC-unknow, tmxf28155 Datasheet - Page 539

• Manufacturer Part Number: tmxf28155
• Description: Tmxf28155 Super Mapper 155/51 Mbits/s Sonet/sdh X28/x21 Ds1/e1
• Manufacturer: ETC-unknow

Preliminary Data Sheet
May 2001
21 28-Channel Framer Block Functional Description
21.27.4 Time-Slot Sequencing
Note: Link numbers can start at 0 by setting FRM_LNKSTART (
Note: The order of the links sent out is in relation to the order in which the Super Mapper framer receives the links.
DS1:
Max time = (1 link time slot interval) + (27 links * 8 bits * NSMI clk period) + (1 link bit time).
Max time = 5.2 µs + (27 * 8 * 19.3 ns) + (648 ns) = 10 µs.
Min time = (1 link time slot interval) – (27 links * 8 bits * NSMI clk period).
Min time = 5.2 µs – (27 * 8 * 19.3 ns) = 1.0 µs.
E1:
Max time = (1 link time slot interval) + (20 links * 8 bits * NSMI clk period).
Max time = 3.9 µs + (20 * 8 * 19.3 ns) = 7.0 µs.
Min time = (1 link time slot interval) – (20 links * 8 bits * NSMI clk period).
Min time = 3.9 µs – (20 * 8 * 19.3 ns) = 0.8 µs.
21.27.5 Timing Between Transmit and Receive
6-Pin Mode. The Super Mapper sends out the data and link information through the transmit signals. While it
sends data, it also expects data to be sent back for the same link number and time slot. The only requirement the
Super Mapper has is that it receives data at a constant time interval every time. For example, at clock 1 data and
link information was sent to the switch. Then at clock 16, data was sent back to the Super Mapper. Thus, the time
taken to send data back was 15 clocks. During this time, the next link and data were sent to the switch at clock 9,
the Super Mapper must receive the second data requested at clock 24. The time interval must be constant. It
doesn’t matter how long, but it must be constant.
Agere Systems Inc.
Link numbers—28 link numbers, numbered 1 to 28 in T1 mode, and 1 to 21 for E1 mode.
In T1 mode, each of the 28 links has 24 time slots and should be numbered 1 to 24.
In E1 mode, each of the 21 links has 32 time slots and should be numbered 0 to 31.
The FSYNC
T1 and time slot 0 in E1 mode).
Link data is sent out in any order. It is totally unpredictable. Time slots are sent in order and it is the job of the
switch to keep track of which time slot it receives.
cause the link numbers for T1 to be numbered 0—27 and for E1, 0—20.
LINETXSYNC29
Thus it is possible, for example, to receive all the time slots for link 5 and then start the next frame of data for
link 5 before link 10 completes its frame.
The minimum and maximum time between successive time slots on a link is calculated below for both DS1
and E1, using an NSMI bus clock of 51.84 MHz (19.3 ns clock period).
LINETXDATA29
LINETXCLK29
(Table
607) bit indicates that the data for the link is in the first time slot for that frame (time slot 1 in
Figure 80. Network Serial Multiplexed Interface (Multiple Octets)
MSB
START
SERIAL DATA
LSB
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
START
Table
SERIAL DATA
347) bit 8 at address 0x80050 to 0. This will
(continued)
TMXF28155/51 Super Mapper
START
SERIAL DATA
5-9102(F)r.1
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