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參數資料
| 型號： | ISD-300A1 |
| 英文描述： | Universal Serial Bus |
| 中文描述： | 通用串行總線 |
| 文件頁數： | 50/67頁 |
| 文件大小： | 580K |
| 代理商： | ISD-300A1 |
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ISD-300A1
45
October 19, 2001
Manufacturing Test Mode
This mode of operation is provided for interconnect test in a manufacturing environment. During
Manufacturing Test Mode operation, all outputs not associated directly with USB operation are
controllable. Normal state machine and register control of output pins is disabled. ISD-300A1 input pins
not associated directly with USB operation can be sampled at any time during normal or Manufacturing
Test Mode operation.
Vendor specific USB commands are used to enable and control Manufacturing Test Mode operation and to
sample input pin states. See
Vendor-Specific Requests
for more details on the LOAD_MFG_DATA and
READ_MFG_DATA USB commands.
External Circuitry
USB, Crystal, and I
2
C Interface Connections
30MHz
9pF
9pF
1.5K
X
X
DM
DP
RPU
36
Note:
For High-speed
operation, the 36
resistors on RSDM and
RSDP combine with 9
internal impedance to
provide 45
on D+ and
D-, or 90
differential
impedance.
36
D +
D -
ISD-300A
SDA
1.5Κ
3.3V
SCL
3.3V
Crystal Specifications:
KDS AT-49, 10 pf load cap., 50 ppm.
Crystals with different specifications
than above will require modified
circuit values for correct operation.
100
RREF
AVSS
9.1Κ
(1%)
RSDP
RSDM
Analog
GND
Analog
VCC
Digital
VCC
ATA Interface
Figure 5 – External Components connection
ATA Interface Considerations
1K Ohm Pull-down Resistor On DD<7>
For “slave” devices, a 1K ohm pull-down resistor must be utilized on DD7 for ISD-300A1 based designs.
This is required for proper operation of the ISD-300A1 master/slave device auto detection algorithm. If
this modification is omitted, slave devices will take an excessive amount of time to initialize (around 30
seconds). In systems with only master devices this modification may be omitted.
ATA_PD_EN and ATA_PU_EN Usage In Self Powered Systems
These signals are controlled by ATA_EN, DRV_PWR_VALID, and DISK_READY. If these inputs are
static, the ATA_Px_EN outputs can be left unconnected and the pull-up and pull-down resistors that
normally connect to these outputs can be directly tied to the appropriate power rails.
1
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