wiki:nightowl:addressing
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wiki:nightowl:addressing [2018/08/08 13:07] gtfjt created |
wiki:nightowl:addressing [2018/09/09 15:16] (current) gtfjt |
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| ^Address^Port Size^Signal^Description^ | ^Address^Port Size^Signal^Description^ | ||
| - | |11xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx|32|kseg2 1023MB|Kernel cached tasks| | + | |''11xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx''|32|kseg2 1023MB|Kernel cached tasks| |
| - | |10xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx|32|kuseg 1024MB|| | + | |''10xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx''|32|kuseg 1024MB|| |
| - | |01xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx|32|kuseg 1024MB|| | + | |''01xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx''|32|kuseg 1024MB|| |
| - | |001x:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx|N/A||Inaccessible 512MB| | + | |''001x:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx''|N/A||Inaccessible 512MB| |
| - | |0001:1111:11xx:xxxx:xxxx:xxxx:xxxx:xxxx|8||Kernel Boot and I/O| | + | |''0001:1111:11xx:xxxx:xxxx:xxxx:xxxx:xxxx''|8||Kernel Boot and I/O| |
| - | |0001:1111:1100:0xxx:xxxx:xxxx:xxxx:xxxx|8||Boot ROM up to 512K| | + | |''0001:1111:1100:0xxx:xxxx:xxxx:xxxx:xxxx''|8|/ROMSEL|Boot ROM up to 512K| |
| - | |0001:1111:1111:1xxx:xxxx:xxxx:xxxx:xxxx|8||| | + | |''0001:1111:1111:1xxx:xxxx:xxxx:xxxx:xxxx''|8||| |
| - | |0001:1111:1111:1111:1111:1111:1111:xxxx|8||Onboard I/O port registers| | + | |''0001:1111:1111:1111:1111:1111:1111:xxxx''|8|/REGSEL|Onboard I/O port registers| |
| - | |0001:1111:1111:1111:1111:1111:1110:xxxx|8||Philips 2681+ DUART| | + | |''0001:1111:1111:1111:1111:1111:1110:xxxx''|8|/SCCSEL|Philips 2681+ DUART| |
| - | |0001:10xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx|||| | + | |''0001:10xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx''|8|/IO8SEL|8-bit I/O space| |
| - | |0001:01xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx|||| | + | |''0001:01xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx''|16|/IO16SEL|16-bit I/O space| |
| - | |0001:00xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx|||| | + | |''0001:00xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx''|32||32-bit I/O space| |
| - | |0000:11xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx|32||64MB Remap Window| | + | |''0000:11xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx''|32||64MB Remap Window| |
| - | |0000:10xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx|32|| | + | |''0000:10xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx''|32|| |
| - | |0000:01xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx|32|| | + | |''0000:01xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx''|32|| |
| - | |0000:00xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx|32||SRAM 64MB starting at 0x00000000| | + | |''0000:00xx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx''|32|/RAMSEL|SRAM 64MB starting at 0x00000000| |
| + | |||
| + | ====== GAL Address Decoding and Select Line Generation ====== | ||
| + | |||
| + | * The master address decoder (MAD) shall be implemented in a 22V10 programmable logic device. | ||
| + | * Select line outputs are configured as inverting so they will go high on asynchronous reset. | ||
| + | * Address lines are not yet metastable on ALE↑. Decoding logic may proceed ungated, with select output flip-flops clocked on next SysClk↓ following ALE↑. | ||
| + | * One FF feeds back to enable all select line outputs. | ||
| + | * /Last high input while /OE enable is low provides the internal asynchronous preset. | ||
| + | * A31:A26 are fully decoded to match 64MB regions. | ||
| + | |||
| + | * /ROMSEL ⇐ /A31 & /A30 & /A29 & A28 & A27 & A26 | ||
| + | * /SCSEL ⇐ | ||
| + | * /RAMSEL ⇐ /A31 & /A30 & /A29 & A28 & A27 & A26 | ||
| + | * | ||
wiki/nightowl/addressing.1533748052.txt.gz · Last modified: 2018/08/08 13:07 by gtfjt
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