SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 288

• Manufacturer Part Number: SC2200
• Description: Thin Client On a Chip
• Manufacturer: NSC [National Semiconductor]

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Core Logic Module
5.4.6
The registers designated as PCIUSB are 32-bit registers
decoded from the PCI address bits [7:2] and C/BE[3:0]#,
when IDSEL is high, AD[10:8] select the appropriate func-
tion, and AD[1:0] are 00.
The PCI Configuration registers are listed in Table 5-41.
They can be accessed as any number of bytes within a sin-
gle 32-bit aligned unit. They are selected by the PCI-stan-
dard Index and Byte-Enable method.
In the PCI Configuration space, there is one Base Address
Register (BAR), at Index 10h, which is used to map the
Index 00h-01h
Index 02h-03h
Index 04h-05h
15:10
Bit
9
8
7
6
5
4
3
2
1
0
USB Controller Registers - PCIUSB
Description
Reserved. Must be set to 0.
Fast Back-to-Back Enable. (Read Only) USB only acts as a master to a single device, so this functionality is not needed.
It is always disabled (i.e., this bit must always be set to 0).
SERR#. When this bit is enabled, USB asserts SERR# when it detects an address parity error.
0: Disable.
1: Enable.
Wait Cycle Control. USB does not need to insert a wait state between the address and data on the AD lines. It is always
disabled (i.e., this bit is set to 0).
Parity Error. USB asserts PERR# when it is the agent receiving data and it detects a data parity error.
0: Disable.
1: Enable.
VGA Palette Snoop Enable. (Read Only) USB does not support this function. It is always disabled (i.e., this bit is set to
0).
Memory Write and Invalidate. Allow USB to run Memory Write and Invalidate commands.
0: Disable.
1: Enable.
The Memory Write and Invalidate Command only occurs if the cache-line size is set to 32 bytes and the memory write is
exactly one cache line.
This bit must be set to 0.
Special Cycles. USB does not run special cycles on PCI. It is always disabled (i.e., this bit is set to 0).
PCI Master Enable. Allow the USB to run PCI master cycles.
0: Disable.
1: Enable.
Memory Space. Allow the USB to respond as a target to memory cycles from the PCI bus.
0: Disable.
1: Enable.
I/O Space. Allow the USB to respond as a target to I/O cycles from the PCI bus.
0 Disable.
1: Enable.
(Continued)
Table 5-41. PCIUSB: USB PCI Configuration Registers
Vendor Identification Register (RO)
Device Identification Register (RO)
Command Register (R/W)
288
USB Host Controller's operational register set into a 4K
memory space. Once the BAR register has been initialized,
and the PCI Command register at Index 04h has been set
to enable the Memory space decoder, these “USB Control-
ler” registers are accessible.
The memory-mapped USB Controller registers are listed in
Table 5-42. They follow the Open Host Controller Interface
(OHCI) specification. Registers marked as “Reserved”, and
reserved bits within a register, should not be changed by
software.
Reset Value: A0F8h
Reset Value: 0E11h
Reset Value: 00h
Revision 3.0