PC8374L datasheet(45/239 Pages) NSC

45 / 239 page

3.0 Device Architecture and Configuration (Continued)

Revision 1.1

www.national.com

Two types of memory transactions are supported: LPC memory read/write and LPC FWH memory read/write. The PC8374L

can respond to only one transaction type at a time. The active type is controlled by TYPESEL bit in MEMADR2 register (see

Section 3.7.3 on page 53). When the active type is FWH, the PC8374L responds only to transactions where the IDSEL value

matches MEMFWHID field in MEMADR2 register. In this case the value of the least significant bit of MEMFWHID is also

used as bit 27 of MEM_BASE, which is the most significant bit of the FWH address.

Figure 6. PC8374L Memory Address Map

Figure 6 shows the memory address map for PC8374L device. The device control and configuration registers (I/O indexes

10h-2Fh) and Logical Device control and configuration registers (I/O indexes 30h-FFh) are located in the last 2K of the de-

vice memory range.

Figure 7 shows the memory address map of Logical Devices with register banks.

The PC8374L device control and configuration registers (I/O indexes 10h-2Fh) are located in last 32 bytes of the memory

mapping, when their memory mapping is enabled by MEMMAP register (see Section 3.7.1 on page 52). Table 20 shows the

memory physical addresses of these registers.

Table 20. Memory Physical Addresses of Device Conﬁguration Registers

I/O Index

Memory Physical Address

PC8374L Configurations

10h-2Fh

MEM_BASE+7FE0h to MEM_BASE+7FFFh

Device Control and

Conﬁguration Registers

(I/O indexes10h-FFh)

7FFFh

7C00h

Logical Device 1Eh Registers

7800h

Logical Device 1Dh Registers

7400h

...

Logical Device 02h Registers

0800h

Logical Device 01h Registers

0400h

Logical Device 00h Registers

0000h

BIOS Memory

Conventional Memory

640K

System Memory Map

MEM_BASE

32K

MEM_BASE+Offset

Window 1

Window 0

PC8374L Memory

PC8374L Memory Map

Winbond Electronics Corp. Advanced PC Product Center

PC8374L датащи(PDF) 45 Page - National Semiconductor (TI)

PC8374L датащи(HTML) 45 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL