PSB7238 SIEMENS [Siemens Semiconductor Group], PSB7238 Datasheet - Page 59

• Manufacturer Part Number: PSB7238
• Description: Joint Audio Decoder-Encoder - Multimode
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

LMOD = 01
LMOD = 10
LMOD = 11
Table 14
LMOD = 00
Table 13
LMOD = 00
Similarly, latencies apply in the case of the data from the output of the HDLC transmitter
FIFOs to the serial output pin. Those are different for the first 1, 2 or 4 bytes (“start”) and
the following bytes (“stationary”):
LMOD = 01
LMOD = 10
LMOD = 11
(programmable via HHX1/2).
During reception/transmission the delay is dynamically increased by the number of zero
insertions in the path between the line and the HDLC receiver/transmitter. Thus, the
numbers in the table refer to the beginning and the end of the frame and any state inside
a frame when no zero insertions are in the pipeline.
The receiver latencies have to be taken into account in systems where the serial clock
is not continuous but is immediately disabled after the last serial data bit has been
received.
The transmitter latencies have to be taken into account in systems where the transmitter
shall start transmitting accurately in one special frame (w.r.t. the line frame sync signal),
e.g. when the transmission has to be started in the first time-slot of a frame-sync burst.
Semiconductor Group
t
: Delay between BFHX1/2 interrupt status and write to HXW1/2 register by DSP or host
Receiver Delays
Transmitter Delays
Start & Stationary
8 C
16 C
32 C
64 C
Start
10 C
11 C +
19 C +
35 C +
TS
TS
TS
TS
+ 9 C
+ 9 C
+ 17 C
+ 33 C
t
t
t
59
Stationary
10 C + 8 C
10 C + 16 C
18 C + 32 C
34 C + 64 C
Data Sheet 1998-07-01
Functional Blocks
TS
TS
TS
TS
PSB 7238