MFC2000 datasheet(286/426 Pages) ETC

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MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

15-6

Conexant

100723A

Bit 6-2:

RxFIFOQty (Receive FIFO Quantity)

Read Only bits.

These five bits hold the value of the amount of bytes stored within the

receive FIFO. As data is written to or removed from the RxFIFO, the

quantity will be adjusted accordingly.

Bit 1-0:

RxFIFOThreshVal (Receive FIFO Threshhold value)

Read/Write bits.

Depending on how these two bits are set, will affect when the receive

FIFO considers itself full enough to cause an interrupt.

Bit Value

# of bytes filled in RxFIFO which should cause

interrupt

“00”

“01”

“10”

“11”

Address:

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Default:

SASIrqSts

01FF80F9

(Not Used)

RxFifo

Overrun

(Read only)

TxFifoFull

(Read only)

TxFifoEmpty

(Read only)

RxFifoFull

(Read only)

RxFifoEmpt

(Read only)

Rst. Value

XXh

Read Value

05h

Address:

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default:

SASIrqSts

01FF80F8

RxTimeout

Elapsed

(Read only)

RxTimeout

Enb

TxBufEmpty

TxFifoThres

(Read only)

TxShfEmpty

(Read only)

RxBufFull

RxFifoThres

(Read only)

TxBufIrqEnb TxShfIrqEnb RxBufIrqEn

Rst. Value

X0XXX000b

Read Value

30h

Bit 15-13:

Not Used

Bit 12:

RxFifoOverrun(Receive FIFO data loss)

Read only bit.

This bit goes high when the receive FIFO is completely full, but an

extra byte has just been received by the RxShiftReg. This will not

cause an interrupt, but the RxFifoThresh should already have done so.

Bit 11:

TxFifoFull(Transmit FIFO full)

Read only bit.

This bit goes high when the transmit FIFO is completely full. Data

cannot be written to the transmit FIFO after this point. This will not

cause an interrupt. This is helpful when trying to figure out if more

bytes can be written to the transmit FIFO.

Bit 10:

TxFifoEmpty(Transmit FIFO empty)

Read only bit.

This bit goes high when the transmit FIFO is completely empty. This

will not cause an interrupt, but the TxFifoThresh should have already

done so.

MFC2000 Datasheet(PDF) 286 Page - List of Unclassifed Manufacturers

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