peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 138

• Manufacturer Part Number: peb20560
• Description: Dsp Oriented Pbx Controller Doc
• Manufacturer: Infineon Technologies Corporation

Semiconductor Group
Figure 2-41 Block Diagram of the PCM-DSP Interface Unit (PEDIU)
Note: a) After reset, both converters (a-/µ-law to linear and linear to a-/µ-law) are
256 x 16
256 x 16
µ
a-law
ROM
-law
Bit
Bit
b) The PEDIU access priority to the circular buffer, is higher then access priority
enabled, and all the DSP-OUT time-slots are in tri-state.
of the DSP. If the DSP tries to access the circular buffer concurrently, with the
PEDIU, it will be delayed by a wait signal from the DCU (DSP bus control unit),
till the end of the PEDIU’s access.
PEDIU
a-/
Linear
IN0
8
Converter
µ
to
Parallel
Serial/
-law
DSP-
16
16
IN1 FSC
8
Control Logic and
Bypass
Flags
DMA Controller
IOM -Multiplexer
DCL OUT0 OUT1 TSC
R
a-/
Linear
Converter
µ
Parallel/
to
-law
Serial
DSP-
8
16
8
UREADP
UWRITEP
PEDIU Register Read
PEDIU Register Write
Syncronized FSC
8
2-92
Bypass
Flags
Tristate
Flags
Frame n
A & D
Circular Buffer
256 x 16-bit RAM in
4 x 64-Word Blocks
Bus
Functional Block Description
16
DCU
DSP-OUT0-0
DSP-OUT1-0
DSP-OUT0-1
DSP-OUT1-1
Control Logic
PEDIU-RAM
DSP-IN0-0
DSP-IN1-0
DSP-IN0-1
DSP-IN1-1
D-Bus
A & Control Bus
Logical Data Flow
Frame n+1
Frame n-1
PEB 20560
DSP
OAK
Mail-Box
2003-08
ITB10095
µ
FSC
P