ml7084-001 Oki Semiconductor, ml7084-001 Datasheet - Page 60

• Manufacturer Part Number: ml7084-001
• Description: 4ch Voip Codec
• Manufacturer: Oki Semiconductor

PCM Interface
(1) Overview
The PCM interface of this LSI consists of the following two interfaces, and SYNC and BCLK are common in each
interface.
(2) PCM Time Slot Configuration
The bit width of one time slot of a PCM interface is fixed to 16 bits.
Therefore, in the case of BCLK = 2.048 MHz, up to 16 time slots (TS#1–TS#16) can be multiplexed on a PCM
interface. However, because upper 8 bits (TSnU: n = 1 to 16) or lower 8 bits (TSnL: n = 1 to 16) can be selected for
one time slot (TSn: n = 1 to 16), up to 32 time slots can be multiplexed on a PCM interface. Figure 26 shows the time
slot structure of a PCM interface.
OKI Semiconductor
Upper/Lower selection
Upper/Lower selection
• I/O interface (PCMO_a, PCMI_a) for CH0a/CH1a PCM data transmission/reception
• I/O interface (PCMO_b, PCMI_b) for CH0b/CH1b PCM data transmission/reception
Time slot selection
Time slot selection
SYNC
SYNC
BCLK
BCLK
Short frame synchronization mode
Long frame synchronization mode
15
15
TS #1 Upper
Note: n is a value obtained by calculating using the following formula :
n = (BCLK frequency)/128 K
Example : When BCLK = 2.048 MHz, n = 16
TS #1 Upper
TS #1
TS #1
TS #1 Lower
TS #1 Lower
Figure 26 Structure of PCM Time Slot
0
0
TS #2 Upper
TS #2 Upper
TS #2
TS #2
TS #2 Lower
TS #2 Lower
TS #n Upper
TS #n Upper
TS #n
TS #n
FEDL7224-001FULL-01
TS #n Lower
TS #n Lower
ML7224-001TC
TS #1 Upper
TS #1 Upper
TS #1
TS #1
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