T
T
T
S
S
S
4
4
4
0
0
0
G D
G
G
H
H
H
D
D
E
E
E
N
N
N
C
C
C
40GB Portable Hard Disk
Transcend Information Inc.
2
Block Diagram
Control signal
USB IDE
Interface
Controller
U
SB C
onnec
to
r
D0~D15
/WE
/RE
40GB
HDD
...
USB-
USB+
D0~D15
Pinouts
Pin No.
Pin Name
01 VCC
02 USB-
03 USB+
04 VSS
Pin Identification
Symbol
Function
USB-
USB+
USB differential signal:
The pairs are used to transmit
Data/Address/Command
VSS
Ground
VCC
USB power input
Crystal
12MHz
