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15.1
Overview
An AFE interface is a circuit to interface with Modem AFE (SGS-Thomson STLC7546/7550); and
is capable of performing a serial data transfer function. A divider is also incorporated to transmit a
master clock to Modem AFE.
15.1.1
Features
• Supports full-duplex serial-data transfer can be achieved with the presence of buffers. The
buffers can be independently used for data transmit and receive.
• Data can be transmitted to and received from the CPU in each 1-word unit to 48-word unit. An
AFE interface contains a 1-word data register and two 48-word data buffers, which can be
selected for data READ or WRITE by users based on the applications.
• Users can perform READ or WRITE operations to only one buffer. Although two buffers are
generally involved for each data transmit or receive, users can use just one buffer, which is not
currently used for the external transfer.
• All the transmit/receive registers and accessible buffers are memory-mapped.
• Data transmit/receive is performed via an interrupt signal. An AFE interface generates a
transmit data empty interrupt and a receive data full interrupt to request data transmit or
receive.
• Data transfer is performed in the MSB-First way.
• Supports three division ratio options: 1/8, 1/7, or 1/6.
Section 15 AFE Interface
Rev. 3.0, 03/01, page 229 of 390
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