PM8313 datasheet(164/192 Pages) PMC

164 / 192 page

PM8313 D3MX

DATA SHEET

PMC-920702

ISSUE 5

M13 MULTIPLEXER

154

Figure 15

- TDLEOMI Timing - With Removal of TDLEOMI Before

Completion of FCS Transmission

WRB &

(A[8:0]='h22)

TDLINT

TDLEOMI

Write last

byte of packet.

Write of 1st byte

of next packet.

< 210 µs

Assertion suppressed

by TDLEOMI

< 846 µs

min 216 µs

max 311 µs

850 µs

Last byte +

FCS transmission

FLAG transmission

Assertion of the TDLEOMI input indicates the latest byte written to the XFDL

Transmit Data Register is the last byte of the current packet. Upon assertion of

TDLEOMI, the frame check sequence (FCS), if enabled, is appended to the

packet once the last byte has been transmitted, and flags ("01111110") are

transmitted in subsequent bytes until another byte is written. The TDLEOMI input

accommodates a wide range of timing: the TDLEOMI input may be asserted as

early as coincident with the falling edge of the write strobe for the last byte

written, but must be asserted within 210 µs of the assertion of the TDLINT output

(or INT bit in the XFDL Status Register). This ensures that the TDLEOMI input is

recognized before the next TDLINT assertion. TDLEOMI must be deasserted

before the write of the first byte of the next packet. If TDLEOMI falls too late, the

first byte is also assumed to be the last, and the FCS (if enabled) and flags are

appended immediately after.

In the example of Figure 15, the TDLEOMI is asserted anytime up to 210µs from

the TDLINT rising edge and is deasserted before the FCS has been completely

transmitted. The TDLINT signal is suppressed by the assertion of TDLEOMI and

remains suppressed until the FCS has completed transmission. TDLINT is

asserted coincident with the beginning of FLAG transmission and remains high

until the first byte of a new packet is written into the data register. While TDLINT

is asserted and the XFDL TSB is awaiting the first byte of a new packet, an

underrun condition cannot occur. Once the first byte is written, however, the

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