isd-t360sb ETC-unknow, isd-t360sb Datasheet - Page 18

• Manufacturer Part Number: isd-t360sb
• Manufacturer: ETC-unknow

ISD-T360SB
The Codec Interface Signals
The codec interface consists of five signals: CDIN,
CDOUT, CCLK, CFS0 and CFS1. The first codec is
connected to CDIN, CDOUT, CCLK and CFS0 (see
Figure 1-9). The second codec is connected to
CDIN, CDOUT, CCLK and CFS1 (see Figure 1-10).
Data is read from the codec through the CDIN in-
put pin, while data is simultaneously transferred to
the codec through the CDOUT output pin (see
Figure 1-8).
The Codec Frame Sync 0 signal (CFS0) is generat-
ed by the codec interface in master mode, and
is generated externally in slave mode.
The Codec Frame Sync 1 signal (CFS1) is generat-
ed by the codec interface in master and slave
modes. The signal is generated with a delay rela-
tive to the CFS0 signal. CFS1 signal may be de-
layed between 0 and 255 CCLK cycles (see
Figure 1-8).
The Codec Clock (CCLK) signal is used to synchro-
nize the data in and out of the codec interface.
The CCLK signal is used to indicate a delay (rela-
tive to CFS0) of data and CFS1 signals. The CCLK
signal is generated according to the pro-
grammed clock rate in master mode, and is gen-
erated externally in slave mode.
I
to the ISD-T360SB and controls the frequency of
the codec interface operation. The CCLK may
take on any frequency between 500 KHz and
2.048 MHz.
In master mode, the codec interface is config-
ured to single bit rate clock. In slave mode, a dou-
ble bit rate clock is available as well. When using
double bit rate clock, the codec interface divides
the frequency in half and the resulting clock is
used as CCLK. Note that the signals are sampled
on the falling edge of CCLK.
1-10
n Slave Mode operation, the CCLK signal is input
Short-frame / Long-frame Formats
The codec may be configured in one of the fol-
lowing formats:
•
•
In short-frame operation, CFS0 and CFS1 are ac-
tive for one CCLK cycle. In long-frame operation,
CFS0 and CFS1 are active for the width of the
transaction.
Short-frame and long-frame formats are available
in both master and slave modes (for more infor-
mation refer to the software description on page
2-9).
A short-frame format (see Figure 1-24)
A long-frame format (see Figure 1-25)
Voice Solutions in Silicon
1—HARDWARE
™