TMPR28051 datasheet(63/90 Pages) AGERE

63 / 90 page

Data Sheet

August 1999

TMPR28051 STS-1/AU-3 (STM-0) Mapper

Lucent Technologies Inc.

Microprocessor Interface Description (continued)

Table 17. DS1/E1 Insertion Selection Format

VT Drop Selection (0x33—0x4E)

Table 18. Registers 0x33—0x4E: VT Drop Selection

5 Programmed DS1/E1INS[4:0]_x Bits

VT1.5 #

VT Group #

VT #

Address

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0001

0010

0011

•

1010

1011

1100

Address

(Hex)

Bit #

Name

Function

Reset

Default

(Hex)

0x33—0x4E

—

Reserved.

Value is

RXESOF[1:28]

The RXESOF[1:28] bits (see VT Drop Selection Registers,

Table 14, page 25) report the receive elastic store overflow

condition. When any of these bits is 1, the corresponding

DS1/E1 output has experienced an elastic store overflow.

This value is latched by these bits until read by the micro-

processor.

TXESOF[1:28]

The TXESOF[1:28] bits (see Control, Alarm, and Mask Bit

Registers, Table 14, page 23) report the transmit elastic

store overflow condition. When any of these bits is 1, the

corresponding DS1/E1 input has experienced an elastic

store overflow. This value is latched by these bits until read

by the microprocessor.

VTDROP4_[1:28] These bits in registers 0x33—0x4E are used to select the

VT1.5 slot for the DS1/E1 outputs. The VT1.5 selected in

Table 17 corresponds to the decimal value of these pro-

grammed 5 bits. If these bits contain 00000, or 11101—

11111, then the device inserts the following:

00000 = device does not transmit any clock or data

11101 = device inserts a DS1 AIS into the corresponding

DS1/E1 slot

11110 = device inserts a E1 AIS into the corresponding

DS1/E1 slot

11111= device inserts the test pattern

Since the device defaults these bits in all 28 of these regis-

ters to 00000, there will be no clock or data in any of the

28 DS1 or 21 E1 slots after reset. VTDROP[4:0]_[1:28],

bits 00001—11100, correspond to the specific VT1.5

streams as shown in Table , page 50. Address 0x33—

0x4E correspond to VTs as shown in Table 20, also on

page 50.

VTDROP3_[1:28]

VTDROP2_[1:28]

VTDROP1_[1:28]

VTDROP0_[1:28]

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