13
On-chip Peripheral s : Computer I/F
■ Low-Pin-Count (LPC) Interface
LPC
PCI/Ho s t Bu s
? A popular interface to communicate
to P C chip set used in notebooks
and P C servers
? P erforms serial data and address
transfer usin g 33MHz clock
Diagram
Ho s t
LPC
? Supports I/O read and write cycles
Fla s h
Super I/O
Embedded
? Supports serial interrupt
on sin g le line
? Supports power-down mode
BIOS
KBC
PP
SP
FDC
Controller
? Reduced pin count
H8S/21xx
■ Keyboard Buffer Controller (KBC)
? Conforms to P S/2 specification
KBC
Diagram
Keyboard
n
? Error detection, parity error and
stop bit monitorin g
0
1
2
3
. .
.
? Five host interrupt requests
Inputs
Scan
Matrix
H8S
Output
■ On-chip Bu s Controller (B S C)
? P rovides g lueless interface with external devices
? Supports basic SRAM, burst-ROM interface
. .
.
? Mana g es external, addressable
16MB re g ion (8 different areas)
? Bus specification can be set
BSC Diagram
independently for each re g ion
? Selectable 8- or 16-bit bus width
? Choice of 0 to 7 pro g rammable
External bu s control s ignal s
Bus
controller
Internal control s ignal s
Bu s mode s ignal
wait-state access
BCR
? Supports direct connection to
S D RAM on selected devices
WSCR
? Includes a bus arbiter for
bus mastership arbitration
? Burst ROM interface
can be set for area 0
WAIT
Wait
controller
CPU bu s reque s t s ignal
DTC bu s reque s t s ignal
? External write cycle and internal
access can be executed in parallel
? Idle-cycle insertion capability
Bus arbiter
CPU bus acknowledge signal
DTC bu s acknowledge s ignal
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