EB632 datasheet(54/112 Pages) FREESCALE

54 / 112 page

Functional Differences Between MSC8101 (Mask 2K42A) and MSC8103 (Mask 2K87M), Rev. 2

Freescale Semiconductor

CPM

14.4.22 Operating the TC Layer at Higher Frequencies

The operation of the TC layer requires a minimum frequency ratio of 1:2.5 between the serial clock and the

UTOPIA clock (in Rx and Tx separately). Using the TC for serial frequencies greater than 10 MHz requires using

higher UTOPIA frequencies to preserve that ratio.

14.4.23 Programming a T1 Application

This section describes how to implement a T1 application using a single TC layer block. Using two or more TCs

requires FCC2 to work in MPHY mode. Assuming that the required ATM parameters and data structures have been

set up and initialized, implementing a T1 application requires the following steps:

Program FCC2. To set up and initialize FCC2, program the FPSMR and GFMR as shown in Table 40. This is

for working with one TC block operating in a single PHY environment. The transmitter and receiver should not

be enabled at this time. In this example, FCC2 does not discard idle cells.

Set up I/O ports and clocks. Because the FCC2 UTOPIA bus is internally connected to the TC UTOPIA bus,

program the parallel ports and BRGs for the active TDM(s).

Enable Tx/Rx on FCC2. To enable receiving and transmitting, program FCC2 as shown in Table 41.

Program CPM multiplexing. To define the connection of FCC2, program the CPM multiplexing as shown in

Table 42.

Program the TC block. The TCx layer block is configured using the TCMODEx and CDSMR1 registers as

shown in Table 43. Note that the TC layer must be enabled after both FCC2 and the CPM multiplexing are

programmed.

Table 40. Programming GFMR and FPSMR to Set Up FCC2

Init Values

Description

FPSMR2 = 0x0080_0000

UTOPIA Rx and Tx in master mode, idle cells are not discarded

GFMR2 = 0x0000_000A

ATM protocol mode, receiver and transmitter are disabled

Table 41. Enable FCC2

Init Values

Description

GFMR2 = 0x0000_003A

Enable Rx and Tx

Table 42. Programming the CPM Multiplexing for a TI Application

Init Values

Description

CMXFCR = 0x0080_0000

FCC2 is connected to the TC Layer

CMXUAR = 0x0000

FCC2 as UTOPIA master

Table 43. Programming the TC Layer Block

Init Values

Description

TCMODE1 = 0xC202

Enable TC Layer Rx and Tx, no error correction on header, the TC is the only PHY on UTOPIA

CDSMR1 = 0x3980

ALPHA = 7, DELTA = 6 (default values)

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