CS5535 datasheet(348/555 Pages) NSC

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348

Revision 0.8

KEL Register Descriptions (Continued)

5.10.1 KEL Specific MSRs

5.10.1.1

Keyboard Emulation Logic Control Register (KELX_CTL)

Port A operation is not effected by Snoop or EmulationEnable settings in KELX_CTL. Bits [31:5] are Reserved. Writes are

“don’t care” and reads always return zero.

MSR Address

5140001Fh

Type

R/W

Reset Value

00000010h

KELX_CTL Register Map

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

87654321

RSVD

KELX_CTL Bit Descriptions

Bit

Name

Description

31:5

RSVD

Reserved. Writes have no effect; reads return 0.

PRTA_EN

Port A Enable. Defaults high. If high, Port A is enabled and accesses to I/O Port 092h

are processed by the CS5535. If low, accesses to I/O Port 092h are passed on to the

LPC bus (where Port A may exist inside a SuperI/O).

3:2

SOFEVENT

Start-Of-Frame (SOF) Event (SOFEVENT) Selection.

00: Test Mode (No delays).

01: USB1 (Default).

10: USB2.

11: 1 ms from PIT.

EER

Emulation Event (EE) Routing.

0: Emulation Interrupt and ASMI.

1: ASMI only.

The EER bit controls keyboard emulation interrupt generation associated with EEs:

• Character Pending - Clear EE by setting the Outputfull bit in the HCE_Status register

or clearing the CharacterPending bit in HCE_Control.

• Input Full - Clear EE by clearing the InputFull bit in HCE_Status.

• External IRQ - Clear EE by clearing IRQ1Active or IRQ12Active as appropriate in

HCE_Control.

0SNOOP

Snoop. Only applies when EmulationEnable in HCE_Control is low. When high, indi-

cates A20 and Init keyboard sequences are to be detected on I/O Port 060h/064h

transactions to the LPC keyboard. KEL must generate ASMI upon detection of A20 and

Init even though EmulationEnable in HCE_Control is low.

Emulation

Enable Snoop

PORTA_A20_ASMI or KEL_INIT_ASMI is generated when sequence

is detected. Status of ASMI Flag and Enable bits are in DIVIL MSR

51400002h.

PORTA_A20_ASMI or KEL_INIT_ASMI is generated when sequence

is detected. KEL_ASMI is generated on InputFull, External IQ, or

Character Pending. Status of ASMI Flag and Enable bits are in DIVIL

MSR 51400002h For the A20 keyboard sequence, both KEL_ASMI

and PORTA_A20_ASMI are signaled.

OFF.

CS5535 数据表(PDF) 348 Page - National Semiconductor (TI)

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