CS5535 datasheet(493/555 Pages) NSC

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PMC Register Descriptions (Continued)

5.18.3.11 PM Working Auxiliary De-assert Delay and Enable (PM_WKXD)

Reads always return the value written, except for RSVD bits [29:20].

PM_WKD Bit Descriptions

Bit

Name

Description

RSVD

Reserved. By convention write 0, but may write anything.

WORKING_

DEASSERT_EN

Working De-assert and Delay Enable. Must be high to de-assert the WORKING out-

put and to enable its delay specified in bits [19:0] (WORKING_DEASSERT_DELAY).

Use of this control implies a system sequence into the Standby state. The PMC dis-

ables its interfaces to non-Standby portions of the component and only considers

wakeup events from Standby circuits. The PMC also immediately asserts system reset

when SLP_CLK_EN# is asserted regardless of the value of

WORKING_DEASSERT_DELAY (bits [19:0]). Reset remains asserted throughout the

Standby state.

There is NOT an assert delay. The wakeup event causes the WORKING output to

assert. This event is called Standby wakeup.

On wakeup, Reset will continue to be applied to all non-Standby circuits for the length

of time specified in the RESET_DELAY (PMS I/O Offset 38h[19:0]).

Enabling this function and/or the function in PM_WKXD (PMS I/O Offset 34h[30] = 1)

causes the same Standby state events. Standby state is not entered unless

SLP_CLK_EN# is asserted.

29:20

RSVD

Reserved. By convention write 0, but may write anything. Reads return 0.

19:0

WORKING_

DEASSERT_

DELAY

Working De-assert Delay. Indicates the number of 32 kHz clock edges to wait from the

assertion of SLP_CLK_EN# before de-asserting the WORKING output. Bit 30

(WORKING_DEASSERT_EN) must be high to enable this delay.

PMS I/O Offset

34h

Type

R/W

Reset Value

00000000h

PM_WKXD Register Map

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

9876543210

RSVD

WORK_AUX_DEASSERT_DELAY

PM_WKXD Bit Descriptions

Bit

Name

Description

RSVD

Reserved. By convention write 0, but may write anything.

CS5535 Datasheet(PDF) 493 Page - National Semiconductor (TI)

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