7.22 PCI PHY Control Register

The PCI PHY control register provides a method for enabling the PHY CNA output. See Table 7−19 for a complete description of the register contents.

Bit

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

 

 

PCI PHY control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

R

R

R

R

R

R

R

R

R

R

R

R

R

R

R

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Bit

15

 

14

 

13

 

12

 

11

 

10

9

8

7

6

5

4

3

2

 

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

 

 

 

 

 

 

 

 

PCI PHY control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

R

 

R

 

R

 

R

 

R

 

R

R

R

RW

R

R

RW

RW

RW

 

RW

RW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

0

 

0

 

0

 

 

0

 

0

 

0

0

0

0

0

0

0

1

0

 

0

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register:

PCI PHY control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Offset:

ECh

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type:

Read/Write, Read-only

 

 

 

 

 

 

 

 

 

 

 

 

 

Default:

0000 0008h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 7−19. PCI PHY Control Register Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BIT

 

FIELD NAME

 

 

TYPE

 

 

 

 

 

 

 

DESCRIPTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

31−8

 

 

RSVD

 

 

 

R

Reserved. Bits 31−8 return 0s when read.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7 ‡

 

 

CNAOUT

 

 

RW

When bit 7 is set to 1, the PHY CNA output is routed to terminal P18. When implementing a serial

 

 

 

 

 

 

 

 

 

 

EEPROM, this bit is loaded via the serial EEPROM as defined by Table 3−9 and must be 1 for normal

 

 

 

 

 

 

 

 

 

 

operation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6−5

 

 

RSVD

 

 

 

R

Reserved. Bits 6−5 return 0s when read. These bits must be 0s for normal operation.

 

 

 

 

 

 

 

 

 

 

4 ‡

 

 

PHYRST

 

 

RW

PHY reset. This bit controls the RST input to the PHY. When bit 4 is set, the PHY reset is asserted.

 

 

 

 

 

 

 

 

 

 

The default value is 0. This bit must be 0 for normal operation.

 

 

 

 

 

 

 

 

 

 

 

 

 

3 ‡

 

 

RSVD

 

 

RW

Reserved. Bit 3 defaults to 1 to indicate compliance with IEEE Std 1394a-2000. This bit is loaded via

 

 

 

 

 

 

 

 

 

 

the serial EEPROM as defined by Table 3−9 and must be 1 for normal operation.

 

 

 

 

 

 

 

 

 

 

 

2 ‡

 

 

 

PD

 

 

RW

This bit controls the power-down input to the PHY. When bit 2 is set, the PHY is in the power-down

 

 

 

 

 

 

 

 

 

 

mode and enters the ULP mode if the LPS is disabled. If PD is asserted, then a reset to the physical

 

 

 

 

 

 

 

 

 

 

layer must be initiated via bit 4 (PHYRST) after PD is cleared. The default value is 0. This bit must

 

 

 

 

 

 

 

 

 

 

be 0 for normal operation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1−0 ‡

 

 

RSVD

 

 

RW

Reserved. Bits 1−0 return 0s when read. These bits are affected when implementing a serial

 

 

 

 

 

 

 

 

 

 

EEPROM; thus, bits 1−0 are loaded via the serial EEPROM as defined by Table 3−9 and must be

 

 

 

 

 

 

 

 

 

 

0s for normal operation.

 

 

 

 

 

 

 

 

 

 

These bits are cleared only by the assertion of GRST.

7−15

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Image 175
Texas Instruments PCI7421, PCI7411, PCI7611 PCI PHY control, 19. PCI PHY Control Register Description, Cnaout, Phyrst