821054PQF Integrated Device Technology (Idt), 821054PQF Datasheet - Page 10

• Manufacturer Part Number: 821054PQF
• Description: Audio Codec 4ADC / 4DAC 64-Pin PQFP
• Manufacturer: Integrated Device Technology (Idt)
• Type: PCMr

Specifications of 821054PQF

• Package: 64PQFP
• Number Of Channels: 4ADC /4 DAC
• Number Of Dacs: 4
• Operating Supply Voltage: 5 V

IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE
2.1.2
The digital PCM data can be compressed (A/
shown in
Clock (BCLK) or half of it. The PCM data is transmitted or received
either on the rising edges or on the falling edges of the BCLK signal. The
transmit and receive time slots can offset from the FS signal by 0 to 7
periods of BCLK. All these configurations are made by global register
GREG7, which is effective for all four channels.
the PCM bus. The number of available time slots is determined by the
frequency of the BCLK signal. For example, if the frequency is 512 kHz,
8 time slots (TS0 to TS7) are available. If the frequency is 1.024 MHz,
16 time slots (TS0 to TS15) are available. The IDT821054 accepts
BCLK frequency of 512 kHz to 8.192 MHz at increments of 64 kHz.
of one channel occupies one time slot. The TT[6:0] bits in local register
LREG5 select the transmit time slot for each channel, while the RT[6:0]
bits in LREG6 select the receive time slot for each channel.
The IDT821054 provides two flexible PCM buses for all 4 channels.
The PCM data of each channel can be assigned to any time slot of
When compressed PCM code (8-bit wide) is selected, the voice data
When linear PCM code is selected, the voice data is a 16-bit 2’s
Figure -
PCM BUS
3, the data rate can be configured as same as the Bit
Single Clock
Double Clock
BCLK
BCLK
FS
µ
-law) or linear code. As
Figure - 3 Sampling Edge Selection Waveform
Bit 7
TS0
10
complement number (b13 to b0 are effective bits, b15 and b14 are as
same as the sign bit b13). So, the voice data of one channel occupies
one time slot group, which consists of 2 adjacent time slots. The TT[6:0]
bits in LREG5 select a transmit time slot group for the specified channel.
If TT[6:0] = n(d), it means that time slots TS(2n+1) and TS(2n+2) are
selected. For example, if TT[6:0] = 00H, it means that TS0 and TS1 are
selected. The RT[6:0] bits in LREG6 select a receive time slot group for
the specified channel in the same way.
transmit PCM highway one (DX1) or two (DX2) on the programmed
edges of BCLK according to time slot assignment. The transmit PCM
highway is selected by the THS bit in LREG5. The frame sync (FS)
pulse identifies the beginning of a transmit frame (TS0). The PCM data
is serially transmitted on DX1 or DX2 with MSB first.
PCM highway one (DR1) or two (DR2) on the programmed edges of
BCLK according to time slot assignment. The receive PCM highway is
selected by the RHS bit in LREG6. The frame sync (FS) pulse identifies
the beginning of a receive frame (TS0). The PCM data is serially
received from DR1 or DR2 with MSB first.
The PCM data of each individual channel can be clocked out to
The PCM data of each individual channel is received from receive
PCM Clock Slope Bits
CS = 000
CS = 001
CS = 010
CS = 011
CS = 100
CS = 101
CS = 110
CS = 111
in GREG7:
Transmit
Receive
INDUSTRIAL TEMPERATURE RANGE