Motorola MSC8101 ADS User's Guide Page 268

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Programming Reference
A-14 MSC8101 User’s Guide
1 Accesses are handled by an external memory controller
0 Accesses are handled by the memory controller
EMEMC – External MEMC Enable
, Bit 27
MSEL1 MSEL2
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
BA16 PS1
DECC0 DECC1
WP
MSEL0
BA9 BA10 BA14
0123456789101112131415
BA0 BA3 BA4 BA5 BA6 BA7 BA15BA13BA11BA8BA2BA1 BA12 PS0
MEMORY CONTROLLER
BR[0–7, 10, 11]
Base Register
Address: BR0 (0x10100), BR1 (0x10108), BR2 (0x10110),
BR3 (0x10118), BR4 (0x10120), BR5 (0x10128), BR6 (0x10130),
BR7 (0x10138), BR10 (0x10150), BR11 (0x10158)
Reset: 0–31 depends on reset configuration sequence,
After a system reset, the V bit is set in BR0 and reset in BR[1–7, 10, 11]
*
= Reserved. Write to 0 for future compatibility
Read/Write
*
0
*
0
ATOM0
ATOM1
DR V
EMEMC
Upper 17 bits of each base address register are compared to the
BA[0–16] – Base Address
, Bits 0–16
address on the address bus to determine if the bus master is
accessing a memory bank controlled by the memory controller.
BRx[BA] is used with ORx[AM]
10 16-bit
01 8-bit
PS[0–1] – Port Size
, Bits 19–20
11
00 64-bit
32-bit
10
Normal parity checking
00 Data errors checking disabled
DECC[0–1] – Data Error Correction and Checking
, Bits 21–22
11
Read-modify-write parity checking
ECC correction and checking
01
1 Only read access is allowed
0 Read and write accesses are allowed
WP – Write Protect
, Bit 23
0 Bank is invalid
V – Valid Bit
, Bit 31
1 Bank is valid
1 Data beats of accesses to the address space controlled
0 No data pipelining is done
DR – Data Pipelining
, Bit 30
by the memory controller bank are delayed by 1 cycle
10
Read-after-write-atomic (RAWA)
00 Address space controlled by the memory controller bank
ATOM[0–1] – Atomic Operation
, Bits 28–29
11
Write-after-read-atomic (WARA)
Reserved
01
is not used for atomic operations
001
GPCM-PowerPC local bus
000
GPCM-PowerPC system bus
MSEL[0–2] – Machine Select
, Bits 24–26
101
110 UPMC
UPMB
011
Reserved
010
SDRAM-PowerPC system bus
111 Reserved
100 UPMA
BR
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