CIRCC datasheet(30/70 Pages) SMSC

30 / 70 page

Valid Frame, bit 0

The Valid Frame bit reflects the state of the

internal state variable nActive Frame.

When

nActive Frame=0 (active) Valid Frame=1 (active).

When nActive Frame=1 (inactive) Valid Frame=0

(inactive).

Valid Frame is only defined for the

SCE Encoder/Decoders during Transmit and

Receive.

registers (Table 17).

Typically, the controls in

SCE before message transactions can occur.

Bits and registers marked “reserved” in the table

below cannot be written and return 0s when read.

Programmers must set reserved bits to 0 (zero)

when writing to registers that contain reserved

bits.

Table 17 - Register Block One

Address

Direction

Description

Default

R/W

SCE Configuration Register A

'02'hex

aux

block control

bits

half

duplx

tx po-

larity

rx po-

larity

R/W

SCE Configuration Register B

'00'hex

output mux

bits

loop-

back

wait

string

move

dma

burst

dma

enable

R/W

FIFO Threshold Register

'00'hex

FIFO COUNT

'00'hex

FC7

FC6

FC5

FC4

FC3

FC1

FC0

Reserved

R/W

SCE Configuration Register C

'03'hex

rsvd

tx pw

limit

reserved

DMA Refresh

Count

SCE Configuration Register A (Address 0)

Auxiliary IR, bit 7

When the Auxiliary IR bit is one and the active

device is routed through the Output Multiplexer to

the IR Port or the COM Port, the transmit signal

also appears at the Auxiliary Port.

Block Control, bits 3 – 6

The Block Control bits select one of the six IrCC

2.0 operational modes (Table 18).

The three

low-order

Block

Control bits are

equivalent to the IR Mode bits in the chip-level

configuration space of earlier devices; e.g., the

FDC37C93x IR Option Register, Serial Port 2,

Logical Device 5, Register 0xF1.

Provisions

have

been

made

legacy

devices

accommodate IR Mode selection through either

the chip-level configuration registers or the IrCC

2.0 Block Control bits; i.e., the last write from

either source determines the current mode

selection and is visible in both registers.

CIRCC Datasheet(PDF) 30 Page - SMSC Corporation

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