4
PIN DESCRIPTION
BUFFER TYPE
PER
FUNCTION
(NOTE 1)
BUFFER
TYPE
POWER
WELL
PIN #
NAME
FUNCTION
POWER PINS (12)
21, 68,
VCC
+3.3 Volt Supply Voltage
96
1, 56,
125
VTR
VSS
+3.3 Volt Standby Supply Voltage
(Note 6)
Ground
34, 63,
79, 106
5
2
AVSS
Vbat
Analog Ground
+3.0 Volt Battery Supply
CLOCK PINS (4)
3
4
XTAL1
32.768k Hz XTAL1 Terminal
IXTL
IXTL
Vbat
Vbat
XTAL2/CLKI3 32.768k Hz XTAL2 Terminal/ 32.768kHz
OXTL/I
OXTL/I
2
Standby Clock Input (Note 3)
14.318MHz Clock Input
40 MHz Clock Output
22
CLOCKI
CLKO40
I
I
VCC
VTR
126
OP14
OP14
Clock Control Pin (1)
124
127
128
XOSEL
nPB_IN
nPS_ON
Crystal Oscillator Select (Note 12)
Power Button Control (2)
Power Button Input
I
I
Vbat
IS
IS
VTR
(Note 13)
VTR
Power Supply Output
OD12
OD12
FDD INTERFACE (14)
6
7
GP40
/DRVDEN0
General Purpose I/O /Drive Density Select 0 IO12
(I/O12/OD12)
/(O12/OD12)
VCC
GP41
/DRVDEN1
General Purpose I/O /Drive Density Select 1 IO12
(I/O12/OD12)/
(O12/OD12)/O1
2
VCC
(Note 13)
8
nMTR0
Motor On 0
O12
IS
(O12/OD12)
IS
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
9
nDSKCHG
nDS0
Disk Change
Drive Select 0
Step Direction
Step Pulse
10
11
12
13
14
15
16
17
18
19
O12
O12
O12
O12
O12
O12
IS
(O12/OD12)
(O12/OD12)
(O12/OD12)
(O12/OD12)
(O12/OD12)
(O12/OD12)
IS
nDIR
nSTEP
nWDATA
nWGATE
nHDSEL
nINDEX
nTRK0
Write Disk Data
Write Gate
Head Select
Index Pulse Input
Track 0
IS
IS
nWRTPRT
nRDATA
Write Protected
Read Disk Data
IS
IS
IS
IS
LPC INTERFACE (10)
23
24
25
26
27
28
LAD0
Multiplexed Command Address and Data 0
Multiplexed Command Address and Data 1
Multiplexed Command Address and Data 2
Multiplexed Command Address and Data 3
Frame
PCI_IO
PCI_IO
PCI_IO
PCI_IO
PCI_I
PCI_IO
PCI_IO
PCI_IO
PCI_IO
PCI_I
VCC
VCC
VCC
VCC
VCC
VCC
LAD1
LAD2
LAD3
LFRAME#
LDRQ#
Encoded DMA Request
PCI_O
PCI_O
SMSC DS – LPC47S45x
Page 12 of 259
Rev. 07/09/2001
DATASHEET
SMSC [ SMSC CORPORATION ]
