SAA8200HL Datasheet, PDF (10/71 Pages) NXP Semiconductors – Ensation Base integrated wireless audio baseband

Philips Semiconductors
SAA8200HL
Ensation Base integrated wireless audio baseband
7. Functional description
7.1 EPICS7B
The EPICS7B core has only access to four of the five memory spaces, PMEM, XMEM,
YMEM and DIO. Memory space IO is only accessible via the DMA. To distinguish between
the memory spaces, 18-bit addressing is used, of which the two Most Significant (MS) bits
determine which space the address is in, see Table 4. The EPICS7B only knows about the
16 least significant bits and uses special instructions to access DIO space.
EPICS7B access:
XMEM is accessed by EPICS7B when using X in its instructions
YMEM is accessed by EPICS7B when using Y in its instructions
PMEM is accessed by EPICS7B when it is fetching instructions
DIO is accessed by EPICS7B when using D in its instructions.
All 18 bits are used when accessing memory via DMA.
Table 4: Memory spaces
Two MS bits
00
01
10
11
Memory space
XMEM
YMEM
PMEM
DIO or IO
The memory map of the system is described in Table 5 and Figure 4.
Table 5: Memory map
Address
Type
Words
Bits
IO
0x[3]FFFF
DSP control register
64
32
0x[3]FFFE
EPICS7B instruction register
32
0x[3]FFC0 to 0x[3]FFFD user defined
64
32
DIO
0x[3]FF00 to 0x[3]FF3F DIO registers
24
PMEM
0x[2]8000 to 0x[2]97FF PRAM
6144
0x[2]0000 to 0x[2]5FFF PROM ^[1]
24576
0x[2]0000 to 0x[2]00FF BIOSROM ^[1]
YMEM
0x[1]8000 to 0x[1]87FF YRAM
2048
0x[1]0000 to 0x[1]2FFF YROM
12288
XMEM
0x[0]FFC0 to 0x[0]FFFF memory mapped registers
0x[0]0000 to 0x[0]2FFF XRAM
12288
[1] DSP control register bit 0 is selecting PROM or BIOSROM.
SAA8200HL_2
Preliminary data sheet
Rev. 02 — 17 October 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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