Epson S1D13504 ユーザーズマニュアル
Epson Research and Development
Page 19
Vancouver Design Center
Interfacing to the Motorola MPC821 Microprocessor
S1D13504
Issue Date: 01/02/02
X19A-G-010-05
4.4 Register/Memory Mapping
The S1D13504 is a memory mapped device. The DRAM on the MPC821 ADS board
extends from address 0h through 3F FFFFh, so the S1D13504 must be addressed starting
at 40 0000h. A total of 4M bytes of address space is used, where the lower 2M bytes
(from 40 0000h through 5F FFFFh) is reserved for the S1D13504 on-chip registers and the
upper 2M bytes (from 60 0000h through 7F FFFFh) is used for the S1D13504 display
buffer.
extends from address 0h through 3F FFFFh, so the S1D13504 must be addressed starting
at 40 0000h. A total of 4M bytes of address space is used, where the lower 2M bytes
(from 40 0000h through 5F FFFFh) is reserved for the S1D13504 on-chip registers and the
upper 2M bytes (from 60 0000h through 7F FFFFh) is used for the S1D13504 display
buffer.
4.5 MPC821 Chip Select Configuration
Chip select 4 is used to control the S1D13504. The following options are selected in the
base address register (BR4):
base address register (BR4):
• BA[0:16] = 0000 0000 0100 0000 0 – set starting address of S1D13504 to 40 0000h.
• AT[0:2] = 0 – ignore address type bits.
• PS[0:1] = 1:0 – memory port size is 16-bit.
• PARE = 0 – disable parity checking.
• WP = 0 – disable write protect.
• MS[0:1] = 0:0 – select General Purpose Chip Select module to control this chip select.
• V = 1 – set valid bit to enable chip select.
The following options were selected in the option register (OR4):
• AM[0:16] = 1111 1111 1100 0000 0 – mask all but upper 10 address bits; S1D13504
consumes 4M byte of address space.
• ATM[0:2] = 0 – ignore address type bits.
• CSNT = 0 – normal CS/WE negation.
• ACS[0:1] = 1:1 – delay CS assertion by ½ clock cycle from address lines.
• BI = 1 – assert Burst Inhibit.
• SCY[0:3]= 0 – wait state selection; this field is ignored since external transfer
acknowledge is used; see SETA below.
• SETA = 1 – the S1D13504 generates an external transfer acknowledge using the
WAIT# line.
• TRLX = 0 – normal timing.
• EHTR = 0 – normal timing.