TSB12C01APZ datasheet(27/59 Pages) TI

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3–11

3.3

FIFO Access

Access to all the transmit FIFOs is fundamentally the same; only the address to where the write is made

changes.

3.3.1

General

The TSB12C01A controller FIFO-access address map shown in Figure 3–3 illustrates how the FIFOs are

mapped. The suffix _First denotes a write to the FIFO location where the first quadlet of a packet should

be written when the writer wants the packet to be held in the FIFO until a quadlet is written to an update

location.

The suffix _Continue denotes a write to the FIFO location where the second through n–1 quadlets of a packet

could be written.

The suffix _First&Update denotes a write to the FIFO location where the first quadlet of a packet should be

written when the writer wants the packet to be transmitted as soon as possible.

The suffix _Continue&Update denotes a write to the FIFO location where the second through n quadlets

of a packet could be written when the writer wants the packet to be transmitted as soon as possible. The

last quadlet of a multiple quadlet packet should be written to the FIFO location with the notation

_Continue&Update.

1 2 3

5 6 7

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

ATF_First

ATF_Continue

Reserved

ATF_Continue & Update

ITF_First

ITF_Continue

Reserved

ITF_Continue & Update

Reserved

GRF Data

Reserved

80h

84h

88h

8Ch

90h

94h

98h

9Ch

A0h

A4h

A8h

ACh

B0h

B4h

B8h

BCh

C0h

C4h

C8h

CCh

Figure 3–3. TSB12C01A Controller-FIFO-Access Address Map

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