EP80579 Datasheet, PDF (1674/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
select regions implemented by the Expansion bus, each region being 16 Mbytes.
Address bit 27 is not used and will currently alias each chip select region as shown on
the left side of Figure 42-2.
The right side of Figure 42-2 shows the implementation of bit 13:10 of the each Timing
Figure 42-2. Chip Select Address Allocation When There Are no 32-MByte Devices
Programmed
128
MBytes
128
MBytes
16 MB
cs_n[7] (alias)
...
cs_n[0] (alias)
cs_n[7]
cs_n[6]
cs_n[5]
cs_n[4]
cs_n[3]
cs_n[2]
cs_n[1]
cs_n[0]
MMBAR + 0xFFFFFFF
MMBAR + 0xF000000
...
MMBAR + 0x8000000
MMBAR + 0x7000000
MMBAR + 0x6000000
MMBAR + 0x5000000
MMBAR + 0x4000000
MMBAR + 0x3000000
MMBAR + 0x2000000
MMBAR + 0x1000000
MMBAR + 0x0000000
CNFG[4:0] = 0b11110
SIZE = 16 MBytes
0b11100 : 8 MBytes
cs_n[x]
0b11010 : 4 MBytes
0b11000 : 2 MBytes
0b10110 : 1 MBytes
0b00000 : 512 Bytes
and Control (EXP_TIMING_CS) Register. A Timing and Control (EXP_TIMING_CS)
Register is implemented for each of the eight chip selects. Each chip select defines a
base region size of 512 bytes with the actual size of the region given by the formula
shown in Figure 42-3. If the address is outside of the programmed region, the
Expansion bus controller responds with an error.
Figure 42-3. Expansion Bus Memory Sizing
Region Size = 2^{(9+CNFG[4:1] + 16*CNFG[0])}
For Examples of how to use this feature:
If bits 13:9 of Timing and Control (EXP_TIMING_CS0) Register 0 = “00000” an
address space of 2⁹ = 512 Bytes is defined for chip select 0 (EX_CS0_N).
If bits 13:9 of Timing and Control (EXP_TIMING_CS1) Register 1 = “10000” an
address space of 2¹⁷ = 128KBytes is defined for chip select 1 (EX_CS1_N).
If bits 13:9 of Timing and Control (EXP_TIMING_CS2) Register 2 = “11110” an
address space of 2²⁴ = 16Mbytes is defined for chip select 2 (EX_CS2_N).
If bits 13:9 of Timing and Control (EXP_TIMING_CS7) Register 7 = “00001” an
address space of 2²⁵ = 32Mbytes is defined for chip select 7 (EX_CS7_N).
Intel^® EP80579 Integrated Processor Product Line Datasheet
1674
August 2009
Order Number: 320066-003US