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CS4237B Datasheet(PDF) 21 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 21 Page - Cirrus Logic |
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21 / 114 page  BYTE Default Description 155h E 2PROM validation byte 1. The first two bytes tell the Crystal Codec that the E 2PROM exists. 2 BBh E 2PROM validation byte 2 3 00h High byte for length of resource data in E 2PROM 4 DDh Low byte for length of resource data in E 2PROM 5 00h Alternate CDROM (Logical Device 4), ACDbase, Address length mask 6 03h Modem (Logical Device 5), COMbase, Address length mask 7 80h Misc. Configuration Bits: Interrupt Pin Polarities, Key Disables, VCEN, & LD4 features 8 00h Global Configuration Bits: IFM, VCF1 and VCF0, WTEN, SPS 9 0Bh Code Base Byte - Must be 0x0B 10* 20h RESERVED - Must be 0x20 11* 04h RESERVED - Must be 0x04 12* 08h RESERVED - Must be 0x08 13* 10h RESERVED - Must be 0x10 14* 80h RESERVED - Must be 0x80 15* 00h RESERVED - Must be 0x00 16* 00h RESERVED - Must be 0x00 17 00h External Peripheral Port I/O Decode Address Length 00 = 4 bytes, 08 = 8 bytes 08h causes XCTL0/XA2 pin to change to peripheral port address bit XA2. 18* 48h RESERVED - Must be 0x48 19 75h IRQ A/B Selection: Lower nibble = A, Upper nibble = B. Along with next two bytes - specify hardware interrupts tied to IRQA-IRQF pins 20 B9h IRQ C/D Selection: Lower nibble = C, Upper nibble = D. 21 FCh IRQ E/F Selection: Lower nibble = E, Upper nibble = F. 22 10h DMA A/B Selection: Lower nibble = A, Upper nibble = B. This byte and the next byte - specify hardware DRQ/DACKs tied to the DMAA-DMAC pins 23 03h DMA C Selection: Lower nibble = C, Upper nibble = reserved (must be 0). NOTE:The first four bytes are exclusive to the E 2PROM and are not used in the Hostload mode. * Currently not supported. Must be set to default values given in the table. Table 2. Hardware Configuration Data DS213PP4 CS4237B 21 |
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Similar Description - CS4237B |
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