CS61884 データシートの表示（PDF） - Cirrus Logic

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CS61884

Octal T1/E1/J1 Line Interface Unit

Cirrus Logic 

CS61884

3.3 Address Inputs/Loopbacks

SYMBOL

A4

A3

A2

A1

A0

LOOP0/D0

LOOP1/D1

LOOP2/D2

LOOP3/D3

LOOP4/D4

LOOP5/D5

LOOP6/D6

LOOP7/D7

LQFP FBGA TYPE

DESCRIPTION

12

F4

Address Selector Input

Parallel Host Mode - During non-multiplexed parallel host

I mode operation, this pin function as the address 4 input for

the parallel interface.

Hardware Mode - The A4 pin must be tied low at all times.

13

F3

14

F2

15

F1

16

G3

Non-Intrusive Monitoring/Address Selector Inputs

Parallel Host Mode - During non-multiplexed parallel host

mode operation, these pins function as address A[3:0] in-

puts for the parallel interface.

Hardware Mode - The A[3:0] pins are used for port selec-

I tion during non-intrusive monitoring. In non-intrusive

monitoring mode, receiver 0’s input is internally connected

I

to the transmit or receive ports on one of the other 7 chan-

nels. The recovered clock and data from the selected port

I

are output on RPOS0/RNEG0 and RCLK0. Additionally, the

data from the selected port can be output on

I

TTIP0/TRING0 by activating the remote loopback function

for channel 0 (Refer to Performance Monitor Register

(0Bh) (See Section 14.12 on page 36).

Loopback Mode Selector/Parallel Data Input/Output

Parallel Host Mode - In non-multiplexed microprocessor in-

21

G2

I/O terface mode, these pins function as the bi-directional 8-bit

data port. When operating in multiplexed microprocessor in-

22

H3

I/O terface mode, these pins function as the address and data

inputs/outputs.

23

H2

I/O Hardware Mode

- No Loopback - The CS61884 is in a normal operating

24

J4

I/O state when LOOP is left open (unconnected) or tied to

VCCIO/2.

25

J3

I/O

- Local Loopback - When LOOP is tied High, data transmit-

ted on TTIP and TRING is looped back into the analog

26

J2

I/O

input of the corresponding channel’s receiver and output on

RPOS and RNEG. Input Data present on RTIP and RRING

is ignored.

27

J1

I/O - Remote Loopback - When LOOP is tied Low the recov-

ered clock and data received on RTIP and RRING is looped

28

K1

I/O back for transmission on TTIP and TRING. Data on TPOS

and TNEG is ignored.

14

DS485F1

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