h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 155

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

This LSI has an on-chip bus controller (BSC) that manages the bus width and the number of
access states of the external address space. The BSC also has a bus arbitration function, and
controls the operation of the internal bus masters—CPU, data transfer controller (DTC), and RAM
FIFO unit (RFU).
6.1
BSCS200A_000020020300
Expansion area division
Address pin reduction
Basic bus interface
Memory card interface
Burst ROM interface
Idle cycle insertion
Bus arbitration function
The external address space can be accessed as basic expansion areas
A 256-kbyte expansion area can be set and controlled independently of basic expansion
areas in mode 2 (advanced mode)
A CP expansion area can be set and controlled independently of basic expansion areas in
mode 2 (advanced mode)
A 256-kbyte expansion area from H'F80000 to H'FBFFFF can be selected using 18 address
pins and the CS256 signal
A CP expansion area (8 kbytes, basic mode) from H'FFC000 to H'FFDFFF can be selected
using 13 address pins and the CPCS1 signal
A 2-kbyte area from H'(FF)F000 to H'(FF)F7FF can be selected using six to eleven address
pins and the IOS signal
2-state access or 3-state access can be selected for each area
Program wait states can be inserted for each area
A CompactFlash * interface can be supported for the CF expansion area (4 kbytes, memory
card mode) in the CP expansion area
A burst ROM interface can be set for basic expansion areas
1-state access or 2-state access can be selected for burst access
An idle cycle can be inserted for external write cycles immediately after external read
cycles
Includes a bus arbiter that arbitrates bus mastership between the CPU, DTC, and RFU
Features
Section 6 Bus Controller
Rev. 3.00 Jan 25, 2006 page 103 of 872
Section 6 Bus Controller
REJ09B0286-0300