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TMPR4938 Datasheet(PDF) 133 Page - Toshiba Semiconductor |
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TMPR4938 Datasheet(HTML) 133 Page - Toshiba Semiconductor |
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133 / 716 page  Chapter 7 External Bus Controller 7-23 (3) ATA Following is a programming example to use an ATA module: • ISA/ATA mode (EBCCRn=11) • 16-bit bus (EBCCRn=10) • READY mode (EBCCRnRDY=1, EBCCRN.PM=00) • Channel enable (EBCCRn.ME=1) • ISA/ATA pin select mode (PCFG.ISA_SEL=1, PCFG.ATA_SEL=1) Program the number of wait cycles, the SHWT option and the bus speed according to the ISA module used. Figure 7.3.18 shows an example of connecting a 16-bit ISA module to the TX4938. Figure 7.3.18 An Example of Connecting an ATA Module Since the ATA has a 16-bit data bus, the same considerations apply to the ATA module as for the 16-bit ISA module. With the EBUSC configured for a 16-bit bus, bits [3:1] of physical addresses are driven out from ADDR[2:0]. Table 7.3.8 shows the relationships in offset addresses between the ATA and the TX4938. For byte accesses, the valid byte lane in the data bus differs, depending on whether the TX4938 is configured for big-endian or little-endian byte ordering. To access 8-bit registers in the ATA address space, address conversion is required, as shown in Table 7.3.8. Table 7.3.8 Relationships Between the ATA Addresses and Physical Addresses TX4938 Physical Address Offset 8-Bit Access ATA Address Offset ATA Register Mnemonic 16-Bit Access Little-Endian Big-Endian 0x1F0 DTR (16bit) 0x103E0 - - 0x1F1 ERR/FTR (8bit) - 0x103E2 0x103E3 0x1F2 SCR (8bit) - 0x103E4 0x103E5 0x1F3 SNR (8bit) - 0x103E6 0x103E7 0x1F4 CLR (8bit) - 0x103E8 0x103E9 0x1F5 CHR (8bit) - 0x103EA 0x103EB 0x1F6 DHR (8bit) - 0x103EC 0x103ED CS[0]* Space 0x1F7 STR/CMR (8bit) - 0x103EE 0x103EF CS[1]* Space 0x3F6 ASR/DCR (8bit) - 0x207EC 0x207ED TX4938 ADDR[15:0] DATA[15:0] IOR* IOW* ACK*/READY ISA-Module SA[15:0] SD[15:0] IOR* IOW* IOCHRDY AEN 16 16 |
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