CS5535 datasheet(418/555 Pages) NSC

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Revision 0.8

5.14 LOW PIN COUNT REGISTER DESCRIPTIONS

The registers for the Low Pin Count (LPC) port are divided

into two sets:

• Standard GeodeLink Device MSRs (Shared with DIVIL,

see Section 5.6.1 on page 299.)

• LPC Specific MSRs

The MSRs are accessed via the RDMSR and WRMSR pro-

cessor instructions. The MSR address is derived from the

perspective of the CPU Core. See Section 3.2 "CS5535

MSR Addressing" on page 53 for more details on MSR

addressing.

All MSRs are 64 bits, however, the LPC Specific MSRs are

called out as 32 bits. The LPC module treats writes to the

upper 32 bits (i.e., bits [63:32]) of the 64-bit MSRs as don’t

cares and always returns 0 on these bits.

The LPC Specific MSRs are summarized in Table 5-54.

The reference column in the summary table points to the

page where the register maps and bit descriptions are

listed.

Table 5-54. LPC Specific MSRs Summary

MSR Address

Type

Reset Value

Reference

5140004Ch

LPC Address Error (LPC_EADDR)

00000000h

Page 419

5140004Dh

LPC Error Status (LPC_ESTAT)

00000000h

Page 419

5140004Eh

R/W

LPC Serial IRQ Control (LPC_SIRQ)

00000000h

Page 419

5140004Fh

R/W

LPC Reserved (LPC_RSVD)

00000000h

Page 419

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