CS61304A データシートの表示（PDF） - Cirrus Logic

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CS61304A

T1/E1 Line Interface

Cirrus Logic 

CS61304A

CS61304A

The data register, shown in Table 10, can be writ-

ten to the serial port. Data is input on the eight

clock cycles immediately following the ad-

dress/command byte. Bits 0 and 1 are used to

clear an interrupt issued from the INT pin, which

occurs in response to a loss of signal or a problem

with the output driver.

LSB: first bit in 0 clr LOS Clear Loss of Signal

1 clr DPM Clear Driver Performance Monitor

2 LEN0 Bit 0 - Line Length Select

3 LEN1 Bit 1 - Line Length Select

4 LEN2 Bit 2 - Line Lenght Select

5 RLOOP Remote Loopback

6 LLOOP Local Loopback

MSB: last bit in 7 TAOS Transmit All Ones Select

Table 10. Input Data Register

Writing a "1" to either "Clear LOS" or "Clear

DPM" over the serial interface has three effects:

1) The current interrupt on the serial interface

will be cleared. (Note that simply reading

the register bits will not clear the inter-

rupt).

2) Output data bits 5, 6 and 7 will be reset as

appropriate.

3) Future interrupts for the corresponding LOS

or DPM will be prevented from occurring.

Writing a "0" to either "Clear LOS" or "Clear

DPM" enables the corresponding interrupt for

LOS or DPM.

Output data from the serial interface is presented

as shown in Tables 11 and 12. Bits 2, 3 and 4 can

be read to verify line length selection. Bits 5, 6

and 7 must be decoded. Codes 101, 110 and 111

(Bits 5, 6 and 7) indicate intermittent loss of sig-

nal and/or driver problems.

SDO goes to a high impedance state when not in

use. SDO and SDI may be tied together in appli-

cations where the host processor has a

bi-directional I/O port.

LSB: first bit in 0

1

2

3

4

LOS

DPM

LEN0

LEN1

LEN2

Loss of Signal

Driver Performance Monitor

Bit 0 - Line Length Select

Bit 1 - Line Length Select

Bit 2 - Line Lenght Select

Table 11. Output Data Bits 0 - 4

Bits

567

Status

0 0 0 Reset has occurred or no program input.

0 0 1 TAOS in effect.

0 1 0 LLOOP in effect.

0 1 1 TAOS/LLOOP in effect.

1 0 0 RLOOP in effect

1 0 1 DPM changed state since last "clear DPM"

occured.

1 1 0 LOS changed state since last "clear LOS"

occured.

1 1 1 LOS and DPM have changed state since

last "clear LOS" and "clear DPM".

Table 12. Coding for Serial Output bits 5,6,7

DS156PFP1 2

1177

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