XRT79L71IB datasheet(80/109 Pages) EXAR

80 / 109 page

XRT79L71

1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - HARDWARE

REV. 1.0.0

If the interrupting device turns out to be the XRT79L71 ATM UNI/PPP/Clear-Channel DS3/E3 Framer IC, then

the µC/µP must determine which functional block requested the interrupt. Hence, upon reaching this state,

one of the very first things that the µC/µP must do within the user supplied XRT79L71 Interrupt Service

Routine, is to perform a read of both of the following registers.

• Operation Interrupt Status Register - Byte 1 (Address = 0x0112)

• Operation Interrupt Status Register - Byte 0 (Address = 0x0113)

The bit-format of each of these registers is presented below.

Each of the Operation Block Interrupt Status Register presents the interrupt-request status of each of the

functional blocks within the chip. The purpose of these two registers is to help the µC/µP identify which

functional block(s) has requested the interrupt. Whichever bit(s) are asserted, in this register, identifies which

block(s) has requested the interrupt. Whichever bit(s) are asserted, in this register, identifies which block(s)

have experienced an interrupt-generating condition as presented in Table 5. Once the µC/µP has read this

service this interrupt.

The XRT79L71 ATM UNI/PPP/Clear-Channel DS3/E3 Framer IC further supports the Operational Block

hierarchy by providing the Operation Block Interrupt Enable Register - Bytes 1 and 0. The bit format of these

two registers are identical to that for the Operation Block Interrupt Status Registers - Byte 1 and 0, and are

presented below for the sake of completeness.

Operation Interrupt Status Register - Byte 1 (Address = 0x0112)

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

Unused

DS3/E3 LIU/

JA Block Inter-

rupt Status

DS3/E3

Framer Block

Interrupt Sta-

tus

Unused

R/O

Operation Interrupt Status Register - Byte 0 (Address = 0x0113)

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

Unused

Receive ATM Cell/

PPP Processor

Block Interrupt Sta-

tus

Unused

Transmit ATM Cell/

PPP Processor

Block Interrupt Sta-

tus

R/O

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