CS5535 datasheet(350/555 Pages) NSC

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Revision 0.8

KEL Register Descriptions (Continued)

5.10.2.2

KEL HCE Input (KEL_HCE_IN)

I/O data that is written to I/O Port 060h and 064h is captured in the HCE_Input register when emulation is enabled. This

register may be read or written directly by accessing it with its memory address in the KEL’s operational register space.

When accessed directly via the KEL’s operational address space, reads and writes of this register have no side effects.

5.10.2.3

KEL HCE Output (KEL_HCE_OUT)

The data placed in the HCE_Output register by the emulation software is returned when I/O Port 060h is read and emula-

tion is enabled. On a read of this location, the OutputFull bit in HCE_Status is cleared to 0.

KEL Memory Offset 104h

Type

R/W

Reset Value

000000xxh

KEL_HCE_IN 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

Input_Data

KEL_HCE_IN Bit Descriptions

Bit

Name

Description

31:8

RSVD

Reserved. Writes have no effect; reads return 0.

7:0

Input_Data

Input Data. This register holds data normally read by SSM software. The register value

is normally established by a write to I/O Port 060h or 064h. However, the value can also

be established by a direct write. Such direct writes have no side effects.

KEL Memory Offset 108h

Type

R/W

Reset Value

000000xxh

KEL_HCE_OUT 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

Output_Data

KEL_HCE_OUT Bit Descriptions

Bit

Name

Description

31:8

RSVD

Reserved. Writes have no effect; reads return 0.

7:0

Output_Data

Output Data. This register holds data normally written by SSM software. It is returned

when an I/O read of I/O Port 060h is performed. Writes to this register have no side

effects. After writing this register, SSM software normally sets OutputFull in

HCE_Status.

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