h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 563

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

This LSI has an on-chip host interface (HIF) that enables connection to the ISA bus (X-BUS) and
has an on-chip LPC interface. In the following text, these two host interfaces (HIFs) are referred to
as XBS and LPC, respectively.
The XBS provides a four-channel parallel interface between the chip’s internal CPU and a host
processor.
Communication is carried out via seven control signals from the host processor (CS1, CS2 or
ECS2, CS3, CS4, HA0, IOR, and IOW), six output signals to the host processor (GA20, HIRQ1,
HIRQ11, HIRQ12, HIRQ3, and HIRQ4), and an 8-bit bidirectional command/data bus (HDB7 to
HDB0). The CS1, CS2 (or ECS2), CS3 and CS4 signals select one of the four interface channels.
18.1
IFHSTX0A_000020020700
Control of the fast GATE A20 function
Shutdown of the XBS module by the HIFSD pin
Five host interrupt requests
Features
Section 18 Host Interface X-Bus Interface (XBS)
Section 18 Host Interface X-Bus Interface (XBS)
Rev. 3.00 Mar 21, 2006 page 509 of 788
REJ09B0300-0300