参数资料
型号: 37C669
厂商: SMSC Corporation
英文描述: DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL
中文描述: 电脑98/99顺从超级I / O软盘控制器与红外线支持
文件页数: 46/164页
文件大小: 621K
代理商: 37C669
14
DESCRIPTION OF PIN FUNCTIONS
QFP/
TQFP
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
94
Drive 2
Address X
Interrupt
Request B
DRV2
nADRX
IRQ_B
I
OD24
024
(OD24)
In PS/2 mode, this input indicates whether a
second drive is connected; DRV2 should be
low if a second drive is connected.
This
status is reflected in a read of Status
Register A.
Active low address decode out: used to
decode a 1, 8, or 16 byte address block. (An
external
pull-up
is
required).
Refer
to
Configuration registers CR03, CR08 and
CR09 for more information. This pin has a
30ua internal pull-up. The interrupt request
from a logical device or IRQIN may be
output on IRQ_B. Refer to the configuration
registers for more information.
(If EPP or ECP Mode is enabled, this output
is pulsed low, then released to allow sharing
of interrupts.)
23
IRQIN
I
This pin is used to steer an interrupt signal
from an external device onto one of eight
IRQ outputs IRQA-H.
58
PWRGD
nGAMECS
I
O4
This active high input indicates that the
power (VCC) is valid. For device operation,
PWRGD must be active. When PWRGD is
inactive,
all
inputs
to
Mercury
are
disconnected and put into a low power
mode;
all
outputs
are
put
into
high
impedance. The contents of all registers are
preserved as long as VCC has a valid value.
The driver current drain in this mode drops
to ISTBY - standby current. This input has
an internal 30ua pull-up.
This is the Game Port Chip Select output -
active low.
It will go active when the I/O
address, qualified by AEN, matches that
selected in Configuration register CR1E.
98
I/O Power
NC
No Connect
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