SAA7715 PHILIPS [NXP Semiconductors], SAA7715 Datasheet - Page 16

• Manufacturer Part Number: SAA7715
• Description: Digital Signal Processor
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
9.5
The SAA7715 has a 1.5 kbyte PRAM to store the DSP
instruction code into. Also a 2 kbyte PROM is on-chip
available and can be accessed (memory mapped) without
the need of selecting the PROM or PRAM. The DSP
instruction code can be downloaded into the PRAM via the
I
and 6 respectively.
Table 7 Data word alignment
2001 May 07
2
I
I
I
I
I
2
2
2
2
2
C-bus. The write and read cycle are shown in Figs 5
C-bus
C-bus
C-bus
C-bus
C-bus
Digital Signal Processor
SOURCE
Program RAM
DSP-PRAM
DSP and general control
I
DSP-XRAM
DSP-YRAM
2
C-bus registers
DESTINATION
MBBB BBBB BBBB BBBB BBBB BBBB BBBB BBBL
MBBB BBBB BBBB BBBB BBBB BBBL
MBBB BBBB BBBB BBBB BBBB BBBL
MBBB BBBB BBBB BBBB BBBB BBBL
XXXX MBBB BBBB BBBL
16
The DSP has an instruction word width of 32 bits which
means that this space should be accessed with 4 bytes in
consecutive order and does have the auto-increment
function.
9.6
It is possible to transfer data via the I
destination where it can have different data word length.
Those destinations with data word are shown in Table 7.
Data word alignment
DATA WORD
Preliminary specification
2
C-bus to a
SAA7715H
(NUMBER)
BYTES
4
3
3
3
2