MAC7200 datasheet(700/976 Pages) FREESCALE

700 / 976 page

Initialization/Application Information

MAC7200 Microcontroller Family Reference Manual, Rev. 2

622

Freescale Semiconductor

Figure 30-25. TX FIFO Pointers and Counter

30.13.5.1 Address Calculation for the First-in Entry and Last-in Entry in the TX

FIFO

The memory address of the first-in entry in the TX FIFO is computed by the following equation:

Eqn. 30-8

The memory address of the last-in entry in the TX FIFO is computed by the following equation:

Eqn. 30-9

TX FIFO Base - Base address of TX FIFO

TXCTR - TX FIFO Counter

TXNXTPTR - Transmit Next Pointer

TX FIFO Depth - Transmit FIFO depth, implementation specific

30.13.5.2 Address Calculation for the First-in Entry and Last-in Entry in the RX

FIFO

The memory address of the first-in entry in the RX FIFO is computed by the following equation:

Eqn. 30-10

Entry A (first in)

Entry B

Entry C

Entry D (last in)

Push TX FIFO Register

Transmit Next

Data Pointer

Shift Register

SOUT

-1

TX FIFO Counter

TX FIFO Base

First-in Entry Address

TX FIFO Base

TXNXTPTR

()

Last-in Entry address

TX FIFO Base

modulo TX FIFO depth TXCTR

TXNXTPTR

–

()

First-in Entry Address

RX FIFO Base

POPNXTPTR

()

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