EasyManuals Logo

Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 User Manual

Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03
631 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #177 background image
II CORE BLOCK: BCU (Bus Control Unit)
S1C33L03 FUNCTION PART EPSON B-II-4-1
A-1
B-II
BCU
II-4 BCU (Bus Control Unit)
The BCU (Bus Control Unit) provides an interface for external devices and on-chip user logic block. The types
and sizes of memory and peripheral I/O devices can be set for each area of the memory map and can be controlled
directly by the BCU. This unit also supports a direct interface for DRAM and burst ROM. This chapter describes
how to control the external and internal system interface, and how it operates.
Note: The control registers of the external system interface shown in this chapter are mapped to the
internal 16-bit I/O area. Therefore, the addresses of these control registers are indicated by half-
word (16-bit) addresses unless otherwise specified. Note that the control registers can be
accessed in bytes, half-words, or words.
Pin Assignment for External System Interface
I/O Pin List
External I/O pins
Table 4.1 lists the pins used for the external system interface.
Table 4.1 I/O Pin List
Pin name I/O Function
A[0]/#BSL O Address bus (A0) / Bus strobe (Low-byte)
A[10:1]/SDA[9:0]
O
Address bus (A1–A10) / SDRAM address bus (SDA0–SDA9)
A11
O
Address bus (A11)
A[13:12]/SDA[12:11]
O
Address bus (A12–A13) / SDRAM address bus (SDA11–SDA12)
A[15:14]/SDBA[1:0]
O
Address bus (A14–A15) / SDRAM bank select (SDBA0–SDBA1)
A[23:16] O Address bus (A16–A23)
D[15:0] I/O Data bus (D0–D15)
#CE10EX/#CE9&10EX O Area 10/(9&10) external memory chip enable
#CE9/#CE17/#CE17&18 O Area 9/17/(17&18) chip enable
#CE8/#RAS1/#CE14/#RAS3/#SDCE1 O Area 8/14 chip enable / DRAM Row strobe / SDRAM chip enable 1
#CE7/#RAS0/#CE13/#RAS2/#SDCE0 O Area 7/13 chip enable / DRAM Row strobe / SDRAM chip enable 0
#CE6/#CE7&8 O Area 6/(7&8) chip enable
#CE5/#CE15/#CE15&16 O Area 5/15/(15&16) chip enable
#CE4/#CE11/#CE11&12 O Area 4/11/(11&12) chip enable
#RD O Read signal
#EMEMRD O Read signal for area 3/10 emulation mode
#WRL/#WR/#WE O Write (Low-byte) / Write / DRAM write
#WRH/#BSH O Write (High-byte) / Bus strobe (High-byte)
#HCAS/#SDCAS O DRAM column address strobe (High-byte) / SDRAM column address strobe
#LCAS/#SDRAS O DRAM column address strobe (Low-byte) / SDRAM row address strobe
BCLK/SDCLK O Bus clock output / SDRAM operating clock
P35/#BUSACK/GPIO1 I/O I/O port / Bus request acknowledge / LCDC general-purpose input/output
P34/#BUSREQ/#CE6/GPIO0 I/O I/O port / Bus release request / Area 6 chip enable / LCDC general-purpose
input/output
P33/#DMAACK1/SIN3/SDA10 I/O I/O port / HSDMA Ch. 1 acknowledge output / Serial I/F Ch. 3 data input /
SDRAM address bus 10
P32/#DMAACK0/#SRDY3/HDQM I/O I/O port / HSDMA Ch. 0 acknowledge output / Serial I/F Ch. 3 ready signal output /
SDRAM data (high byte) input/output mask signal output
P31/#BUSGET/#GARD/GPIO2 I/O I/O port / Bus status monitor signal output / Area read signal output for GA /
LCDC general-purpose input/output
P30/#WAIT/#CE4&5 I/O I/O port / Wait cycle request / Areas 4&5 chip enable
P21/#DWE/#GAAS/#SDWE I/O I/O port / DRAM write (Low-byte) / Area address strobe output for GA / SDRAM write
P20/#DRD/SDCKE I/O I/O port / DRAM read / SDRAM clock enable
P15/EXCL4/#DMAEND0/#SCLK3/LDQM I/O I/O port / 16-bit timer 4 event counter input / HSDMA Ch. 0 end-of-transfer signal
output / Serial I/F Ch. 3 clock input/output / SDRAM data (low byte) input/output mask
signal output
#X2SPD I CPU - BCLK clock ratio
1: CPU clock = Bus clock, 0: CPU clock = Bus clock x 2
EA10MD[1:0] I Area 10 boot mode selection
11: External ROM, 10: Internal ROM

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 and is the answer not in the manual?

Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Specifications

General IconGeneral
BrandEpson
ModelCMOS 32-Bit Single Chip Microcomputer S1C33L03
CategoryComputer Hardware
LanguageEnglish

Related product manuals