MT90866 View Datasheet(PDF) - Zarlink Semiconductor Inc

Part Name

Description

Manufacturer

MT90866

Flexible 4 K x 2.4 K Channel Digital Switch with H.110 Interface and 2.4 K x 2.4 K Local Switch

Zarlink Semiconductor Inc 

MT90866

Data Sheet

Frame

Boundary

C8_A_io,

CA_B_io

c32o

Frame

Boundary

Thirty-six c32o cycles

BCSTo0

(16 Mb/s Mode)

Figure 7 - Backplane Control (BCSTo) Timing when the STio data rate is 16 Mb/s

15.2 LCSTo Control Stream

The LCSTo control bits are partitioned into 128 time slots, Slots 0 to 127. Each slot has 32 bits. Dummy bits

represent logic levels which should be ignored by the users. The first control bit in Slot 0 is advanced by thirty-two

C32/64o 32.768 Mb/s clock cycles from the frame boundary. See Figure 8, "Local Control (LCSTo) Timing when

STo0-18 are operated at 8 Mb/s" on page 28 for the partition of the time slots and the frame alignment details.

When the STo0-18 streams are operated at 8 Mb/s, Slots 0 to 127 are used to represent the control bits for

Channels 0 to 127 of the 8 Mb/s streams. STo19-17 are driven low in this configuration. See Figure 8, "Local

Control (LCSTo) Timing when STo0-18 are operated at 8 Mb/s" on page 28 for the LCSTo control bit pattern.

When the STo0-18 streams are operated at 4 Mb/s, Slots 2N (where N = 0 to 63) have the control bit pattern but

Slots 2N+1 have dummy bits which should be ignored by the user. STo19-17 are driven low in this configuration.

See Figure 9, "Local Control (LCSTo) Timing when STo0-18 are operated at 4 Mb/s" on page 29 for the LCSTo

control bit pattern.

When the STo0-27 streams are operated at 2 Mb/s, Slots 4N (where N = 0 to 31) have the control bit pattern, but

Slots 4N+1, 4N+2 and 4N+3 have dummy bits. See Figure 10, "Local Control (LCSTo) Timing when all STo0-27 are

operated at 2 Mb/s" on page 30 for the LCSTo control bit pattern.

When the STo streams are programmed with various data rates as described in Table 6 on page 20, the available

control bit positions in every time slot is associated with the corresponding output stream channels which operate at

various data rates. Figure 11, "Example of Local Control (LCSTo) Timing when the Local Streams have Different

Data Rates" on page 31 gives an example when STo0-3, 4-7, 8-11, 12-15, 16-27 are programmed to operate at

8 Mb/s, 4 Mb/s, 8 Mb/s, 4 Mb/s and 2 Mb/s respectively.

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Zarlink Semiconductor Inc.

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