ST5090 ST Microelectronics, ST5090 Datasheet - Page 7

• Manufacturer Part Number: ST5090
• Description: LOW VOLTAGE 14-BIT LINEAR CODEC WITH HIGH-PERFORMANCE AUDIO FRONT-END
• Manufacturer: ST Microelectronics

Figure 1: Digital Interface Format (*)
(*) Significant Only For Companded Code.
propriate programmable register. CS- must return
high at the end of the 2nd byte.
To read-back status information from ST5090, the
first byte of the appropriate instruction is strobed
in during the first CS- pulse, as defined in Table
1. CS- must be set low for a further 8 CCLK cy-
cles, during which data is shifted out of the CO
pin on the falling edges of CCLK.
When CS- is high, CO pin is in the high imped-
ance Tri-state, enabling CO pins of several de-
vices to be multiplexed together.
Thus, to summarise, 2 byte READ and WRITE in-
structions may use either two 8-bit wide CS-
pulses or a single 16 bit wide CS- pulse.
I
It is possible to access the B channel previously
.8 Control channel access to PCM interface:
MCLK
MCLK
DR
DR
F5
F6
DX
F8
F9
DX
FORMAT 1
FORMAT 2
(delayed timing)
(delayed timing)
B1
B1
B1
B1
X
(non delayed timing)
(non delayed timing)
B2
B2
B2
B2
selected in Register CR1 in the case of com-
panded code only.
A byte written into Control Register CR3 will be
automatically transmitted from D
following frame in place of the transmit PCM data.
A byte written into Control Register CR2 will be
automatically sent through the receive path to the
Receive amplifiers.
In order to implement a continuous data flow from
the Control MICROWIRE interface to a B chan-
nel, it is necessary to send the control byte on
each PCM frame.
A current byte received on D
in the register CR2. In order to implement a con-
tinuous data flow from a B channel to MI-
CROWIRE interface, it is necessary to read regis-
ter CR2 at each PCM frame.
X
D93TL075
X
X
R
input can be read
X
X
X
output in the
ST5090
7/29