PM8313 datasheet(156/192 Pages) PMC

156 / 192 page

PM8313 D3MX

DATA SHEET

PMC-920702

ISSUE 5

M13 MULTIPLEXER

146

Figure 7

- RFDL Normal Data and Abort Sequence

Serial Data

extracted from

Datalink

RDLINT

RDLEOM

D[7:0]

Flag

RC1

Flag

B2 B3

Dn-2

Dn-1

B2 B3

Dn-1

Dn-3

D1 B1

ABORT

EOM

R Abort

This diagram shows the relationship between RFDL inputs and outputs for the

case where interrupts are programmed to occur when one byte is present in the

FIFO buffer. The RFDL is assumed to be operating in the interrupt driven mode.

Each read shown is composed of two register reads: first a read of the Data

deasserts the RDLINT output if no more data exists in the FIFO buffer. The

status of the FE bit returned in the Status Register read will indicate the FIFO

buffer fill status as well. The Data Register read Dn-2 is shown to occur after two

bytes have been written into the buffer. The RDLINT output is not deasserted

after the first Data Register read because a data byte still remains to be read.

The RDLINT output is deasserted after Data Register read Dn-1. The FE bit will

be logic 0 in Status Register read Dn-2 and logic 1 in Status Register read Dn-1.

The RDLEOM output goes high as soon as the last byte in the frame is read from

the Data Register. The RDLINT output will be deasserted if the FIFO buffer is

empty. The next Status Register read will return a value of logic 1 for the EOMR

and FLG bits, and cause the RDLEOM output of the RFDL to return low.

In the next frame, the first data byte is received, and after a delay of ten bit

periods, it is written to the FIFO buffer, and read by the processor after the

interrupt. When the abort sequence is detected, the data received up to the

abort is written to the FIFO buffer and an interrupt generated. The processor

then reads the partial byte from the Data Register and the RDLEOM output is set

high. The processor then reads the Status Register which will return a value of

logic 1 for the EOMR and FLG bits, and set the RDLEOM output low. The FIFO

buffer is not cleared when an abort is detected. All bytes received up to the

abort are available to be read.

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