CS5535 datasheet(286/555 Pages) NSC

286 / 555 page

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286

Revision 0.8

USB Register Descriptions (Continued)

5.5.4.15

Host Controller Frame Remaining (USBC_HcFrameRemaining)

5.5.4.16

Host Controller Frame Number (USBC_HcFmNumber)

USB Memory Offset

38h

Type

HCD:

HC:

R/W

Reset Value

00000000h

USBC_HcFrameRemaining Register Map

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

7654321

RSVD

FrameRemaining

USBC_HcFrameRemaining Bit Descriptions

Bit

Name

HCD

Description

FrameRemaining

Toggle

R/W

Frame Remaining Toggle. Loaded with FrameIntervalToggle

when FrameRemaining is loaded.

30:14

RSVD

R/W

Reserved. Read/write 0s.

13:0

FrameRemaining

R/W

Frame Remaining. When the HC is in the UsbOperational state,

this 14-bit field decrements each 12 MHz clock period. When the

count reaches 0, (end of frame) the counter reloads with

FrameInterval. In addition, the counter loads when the HC transi-

tions into UsbOperational.

USB Memory Offset

3Ch

Type

HCD:

HC:

R/W

Reset Value

00000000h

USBC_HcFmNumber Register Map

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

7654321

RSVD

FrameNumber

USBC_HcFmNumber Bit Descriptions

Bit

Name

HCD

Description

30:16

RSVD

R/W

Reserved. Read/write 0s.

15:0

FrameNumber

R/W

Frame Number. This 16-bit incrementing counter field is incre-

mented coincident with the loading of FrameRemaining. The

count rolls over from FFFFh to 0h.

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