IRCC datasheet(38/79 Pages) SMSC

38 / 79 page

registers.

These registers control the IrDA

message framing parameters, HDLC clock

speed, and hardware CRC selection.

The

registers are read/write.

Table 26 - SCE Register Block Four

Address

Direction

Description

Default

R/W

IrDA Control Register

'C0'hex

1.152

selec

crc

selec

bof count

(high nibble)

R/W

bof count (low byte)

'00'hex

R/W

brick wall count (low byte)

'00'hex

R/W

brick wall count (high nibble)

tx data size (high nibble)

'00'hex

R/W

tx data size (low byte)

'00'hex

R/W

rx data size (high nibble)

'00'hex

R/W

rx data size (low byte)

'00'hex

IrDA

Control

Count

High

(Address 0)

1.152 Select, bit 7

When the 1.152 Select bit is one, the IrDA

1.152Mbps HDLC-type FIR data rate is selected.

Otherwise the .576Mbps rate is chosen. This bit

only applies to the SCE clock when the Block

Control bits select Mode 2, IrDA HDLC.

CRC Select, bit 6

When the CRC Select bit is one, a hardware-

generated CRC is appended to the frame

payload

data

during

IrDA

FIR

message

transactions (Table 22).

BOF Count High, bits 0 - 3

The BOF Count specifies the number of

additional flags that are used in a BOF

sequence. For example, at 1.152Mbps, insert

the BOF Count number of additional flag

characters ('7E'hex) at the start of every frame,

excluding brick walled frames.

At 4Mbps insert

the BOF Count number of additional PA bytes at

the start of every frame, excluding brick walled

frames. The BOF Count is a 12-bit value. This

upper nibble.

BOF Count Low (Address 1)

The BOF Count Low register is the lower byte of

the BOF Count.

Brick Wall Count Low (Address 2)

The Brick Wall Count register specifies the

number of additional interframe padding flags

used for brick walled messages. The Brick Wall

Count is a 12-bit value. The Brick Wall Count

Low register is the Brick Wall Count lower byte.

BW Count High/Tx Data Size High

(Address 3)

Brick Wall Count High, bits 4 - 7

The BW Count High register is the upper nibble

of the Brick Wall Count.

Tx Data Size High, bits 0 - 3

The Tx Data Size register specifies the IrLAP-

negotiated maximum number of payload data

bytes per IrDA transmit message frame if

software CRC is selected, or the IrLAP-

negotiated maximum number of payload data

bytes minus the number of CRC bytes if

hardware CRC is selected. This register is used

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