XRT8001IP datasheet(16/48 Pages) EXAR

16 / 48 page

XRT8001

Rev. 1.01

3.0

Description of the Command Registers

3.1

Address Map of the "On-Chip" Command

Registers

Address

Command

Type

0x00

CR0

R/W

IOC4

IOC3

IOC2

IOC1

PL1EN

0x01

CR1

R/W

PL2EN

0x02

CR2

R/W

SEL14

SEL13

SEL12

SEL11

SEL10

0x03

CR3

R/W

SEL24

SEL23

SEL22

SEL21

SEL20

0x04

CR4

R/W

SYNCEN

CLK1EN

CLK2EN

LDETDIS2

LDETDIS1

0x05

CR5

R/W

Reserved

0x06

CR6

R/W

Reserved

0x07

CR7

R/W

Reserved

3.2

Command Register Description

3.2.1 Command Register CR0 (Address = 0x00)

D4 – D1 (Configuration Mode Select Bits)

These four-bit fields permit the user to select which

mode the XRT8001 will operate in. Specifically, these

four bit-fields make the following configuration selec-

tions:

1. Whether the XRT8001 will be operating in the

“Forward/Master”, “Reverse/Master”, “Fractional

T1/E1 Reverse/Master”, "E1 to T1 - Forward/Mas-

ter" and “High Speed - Reverse” odes.

What kind of input signals are to be applied to the

Reference Clock Input (FIN).

What kind of signals will be output via the CLK1

and CLK2 output pins.

Table 2A relates the value of these four bit-fields to the

four Master Modes and Table 2B relates to the three

Slave Modes of the XRT8001.

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