cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 61

• Manufacturer Part Number: cs5535
• Description: Geode Cs5535 Companion Multi-function South Bridge
• Manufacturer: National Semiconductor Corporation

Revision 0.8
Global Concepts and Features
affect packet routing from the listed masters. GLIU descrip-
tors are only used to route requests from the GLPCI_SB
and GLCP.
3.7.4
In the CS5535, there are two USB Controllers and hence
two copies of this hardware. The USB control registers are
memory mapped. The memory region associated with
these registers is relocatable via standard GLIU descriptor
MSRs starting at an appropriate base address. The region
size is 4 kB (1000h), that is, an offset range of 000h
through FFFh. There are four registers called: HceControl,
HceInput, HceOutput, and HceStatus. There are no USB
control registers above this region.
Special consideration is given to the legacy keyboard emu-
lation control registers normally associated with the USB
Controller. This “normal” association is due to the fact that
“normally”, the keyboard emulation hardware is physically
located with the USB hardware, even though there is no
logical association between the two at the hardware level.
This “normal” association is driven by industry standard
device drivers that group the two register sets in the same
region. The keyboard emulation registers are located at the
USB base address plus 0100h.
A single copy of the Keyboard Emulation Logic (KEL) hard-
ware is located in the Diverse Device (DD) module, where it
can be closely coordinated with a possible real keyboard
Note 1. See Section 3.8 "Standard GeodeLink Device MSRs" on page 67 for register descriptions.
Device
GLPCI_SB
GLCP
GLIU
ACC
ATAC
USBC1
USBC2
Legacy Keyboard Emulation
Standard GeodeLink Device MSRs plus
Standard GeodeLink Device MSRs plus
MSR Space (Note 1)
Standard GeodeLink Device MSRs plus
GLPCI_SB setup. All MSRs also acces-
sible from PCI Configuration space.
Standard GeodeLink Device MSRs plus
diagnostic and debug.
Standard GeodeLink Device MSRs plus
descriptor setup.
Standard GeodeLink Device MSRs.
Standard GeodeLink Device MSRs plus
timing parameters.
Bus Master LBAR.
PCI configuration emulation.
Must set PCI BAR in USB Controller.
PCI configuration emulation.
Must set PCI BAR in USB Controller.
Table 3-4. CS5535 Register Space Map Except Diverse Device
(Continued)
61
I/O Space
None.
None.
Programmable SSMIs.
16-byte codec I/F plus 48-
byte master interface. All
trap registers removed.
Generates no SSMIs.
Legacy primary addresses.
16-byte master interface.
None.
None.
controller in any of three locations: in either USB Controller
(USBC1 or USBC2), or on the LPC bus. This leaves the
problem of the control registers that are physically in the
DD, but logically (from the software perspective) in the USB
Controller.
A descriptor type is incorporated into the CS5535 to deal
with this keyboard issue. It is a variant of the standard “P2D
Base Mask Descriptor” (P2D_BM) called P2D_BMK (key-
board). A P2D_BMK descriptor does additional decoding
based on Address bit 8. If this bit is low, the hit directs to
the USB port. If this bit is high, the hit directs to the subtrac-
tive port. There are two P2D_BMK descriptors in the
CS5535 (see Section 5.1.2.2 "P2D Base Mask KEL
Descriptors (GLIU_P2D_BMK[x])" on page 195).
3.7.5
Table 3-4 shows the register space map for all CS5535
devices except the Diverse Device. There are no fixed
addresses associated with these devices other than the
MSRs and the legacy IDE I/O addresses as detailed in
Section 3.7.3 "GLIU Decoding".
3.7.6
The Diverse Device “space” map except legacy I/O is
shown in Table 3-5.
GeodeLink Device Decoding Except Diverse
Device
Diverse Device Decoding Except Legacy I/O
Memory Space
None.
None.
Programmable SSMIs.
The register space can be
here also.
None.
4 kB, but less than 256 bytes
used. Keyboard emulation
registers to Diverse Device.
4 kB, but less than 256 bytes
used. Keyboard emulation
registers to Diverse Device.
www.national.com