SC1100 datasheet(263/348 Pages) NSC

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Core Logic Module (Continued)

Read: CurrentConnectStatus.

0: No device connected.

1: Device connected.

If DeviceRemoveable is set (not removable) this bit is always 1.

Write: ClearPortEnable. Writing 1 a clears PortEnableStatus. Writing a 0 has no effect.

Note:

This register is reset by the UsbReset state.

Offset 60h-9Fh

Reserved

Reset Value = xxh

Offset 100h-103h

HceControl Register (R/W)

Reset Value = 00000000h

31:9

Reserved. Read/Write 0s.

A20State. Indicates current state of Gate A20 on keyboard controller. Compared against value written to 60h when

GateA20Sequence is active.

IRQ12Active. Indicates a positive transition on IRQ12 from keyboard controller occurred. Software writes this bit to 1 to

clear it (set it to 0); a 0 write has no effect.

IRQ1Active. Indicates a positive transition on IRQ1 from keyboard controller occurred. Software writes this bit to 1 to clear

it (set it to 0); a 0 write has no effect.

GateA20Sequence. Set by HC when a data value of D1h is written to I/O port 64h. Cleared by HC on write to I/O port 64h

of any value other than D1h.

ExternalIRQEn. When set to 1, IRQ1 and IRQ12 from the keyboard controller cause an emulation interrupt. The function

controlled by this bit is independent of the setting of the EmulationEnable bit in this register.

IRQEn. When set, the HC generates IRQ1 or IRQ12 as long as the OutputFull bit in HceStatus is set to 1. If the AuxOut-

putFull bit of HceStatus is 0, IRQ1 is generated: if 1, then an IRQ12 is generated.

CharacterPending. When set, an emulation interrupt will be generated when the OutputFull bit of the HceStatus register is

set to 0.

EmulationInterrupt (Read Only). This bit is a static decode of the emulation interrupt condition.

EmulationEnable. When set to 1 the HC is enabled for legacy emulation and will decode accesses to I/O registers 60h

and 64h and generate IRQ1 and/or IRQ12 when appropriate. The HC also generates an emulation interrupt at appropriate

times to invoke the emulation software.

Note:

This register is used to enable and control the emulation hardware and report various status information.

Offset 104h-107h

HceInput Register (R/W)

Reset Value = 000000xxh

31:8

Reserved. Read/Write 0s.

7:0

InputData. This register holds data written to I/O ports 60h and 64h.

Note:

This register is the emulation side of the legacy Input Buffer register.

Offset 108h-10Bh

HceOutput Register (R/W)

Reset Value = 000000xxh

31:8

Reserved. Read/Write 0s.

7:0

OutputData. This register hosts data that is returned when an I/O read of port 60h is performed by application software.

Note:

This register is the emulation side of the legacy Output Buffer register where keyboard and mouse data is to be written by soft-

ware.

Table 5-42. USB_BAR+Memory Offset: USB Controller Registers (Continued)

Bit

Description

SC1100 Datasheet(PDF) 263 Page - National Semiconductor (TI)

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