GMS30C7201 Datasheet, PDF (284/352 Pages) Hynix Semiconductor – 60MHz operation frequency Low power consumption

Slow AMBA Peripherals
13.9 Analog Front End, AFE (CODEC Interface)
13.9.1 Module overview
The Analog Front End (AFE) interface is an APB peripheral which allows direct connection to
a telephony-type CODEC. It provides all the necessary clocks and timing pulses, and also
performs the parallel-to-serial conversion on output data and serial-to-parallel conversion on
input data. The interface is full duplex, and contains two separate data FIFOs.
BnRES
INTAFE
PSEL
PWRITE
PSTB
PA[3:2]
PD[15:0]
RLY RING
APB
Interface
CODEC
Interface
SDO
nCON
SDI
SDFS
SCLK
CODEC
(GM0815)
Figure 13-7: Signal connections of the AFE interface
Data is transferred to or from the CODEC at 56Kb per second. The data is either written to, or
read from, the appropriate 32-byte FIFO. An interrupt is generated when the FIFO is empty,
when an error occurs or when the ringing signal is detected.
13.9.2 Signal description
The AFE Interface module is connected to the APB. Table 13-38: Signal descriptions describes
the relevant APB signals. Table 13-39: Specific block signal descriptions on page 13-57 shows
the non-AMBA signals from the block.
Name
BnRES
PA[6:2]
Type
In
Source/
Destination
Reset Controller
In
APB Bridge
Description
This signal indicates system reset status of the bus
(active LOW).
This is part of the peripheral address bus, which is used
by the peripheral for decoding its own register accesses.
The addresses become valid before PSTB goes HIGH
and remain valid after PSTB goes LOW.
Table 13-38: Signal descriptions
13-56
GMS30C7201 Data Sheet