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參數(shù)資料
| 型號(hào)： | ISD-300A1 |
| 英文描述： | Universal Serial Bus |
| 中文描述： | 通用串行總線 |
| 文件頁(yè)數(shù)： | 8/67頁(yè) |
| 文件大?。?/td> | 580K |
| 代理商： | ISD-300A1 |
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ISD-300A1
3
October 19, 2001
Pin Name
TQFP
Pin #
Dir
Type
Description
NRESET
35
I
LVTTL, 5V
tolerant,
hysteresis
OSC input
Active low. Asynchronous chip reset. To evoke
reset, NRESET must be held asserted for a
minimum of 1 ms after power is stable.
30 MHz crystal connection. 3.3V tolerant input.
XI
30
I
XO
31
O
OSC output
30 MHz crystal connection.
TEST0 – TEST3
23, 24, 27, 28
I
LVTTL, 5V
tolerant, internal
pull-down
resistor
Active high. ASIC fabrication and mfg. test
mode select. The TEST pins must be a no-
connect or set to 0x0 during normal operation.
SCAN_EN
22
I
LVTTL, 5V
tolerant, internal
pull-down
resistor
Active high. ASIC test – scan chain enable.
SCAN_EN must be a no-connect or set to 0
during normal operation.
ATA_EN
33
I
LVTTL, 5V
tolerant,
hysteresis
Active high. ATA interface enable. Allows ATA
bus sharing with other host devices.
Setting ATA_EN=1 enables the ATA interface
for normal operation. Disabling ATA_EN 3-
states (high-Z) the ATA interface and halts the
ATA interface state machine logic.
SYS_IRQ
98
I
LVTTL, 5V
tolerant, internal
pull down
resistor,
hysteresis
Active high. USB interrupt. SYS_IRQ controls
ISD-300A1 responses to USB interrupt pipe
requests. Setting SYS_IRQ = 1 enables the return
of interrupt data to the host.
DISK_READY
99
I
LVTTL, 5V
tolerant,
hysteresis
Active high. Indicates device is powered and
ready to begin accepting ATA / ATAPI
commands.
NLOWPWR
52
O
12 mA LVTTL,
5V tolerant
Active low. Indicates when the ISD-300A1 is in
a low power state of operation. Open drain
during normal operation.
NPWR500
92
O
12 mA LVTTL,
5V tolerant
Active low. Indicates the USB host has enabled
use of VBUS power (USB configuration set to 1)
up to the requested amount in the USB descriptor
bMaxPower
entry. VBUS powered devices must
condition power circuitry with the state of the
VBUS_POWERED signal for correct operation.
Open drain during normal operation.
VBUS_POWERED
3
I
LVTTL, 5V
tolerant,
hysteresis
Active high. Indicates the amount of VBUS
current the system is capable of consuming
(typically <= 100 mA OR <= 500 mA)
VBUS_PWR_VALID
4
I
LVTTL, 5V
tolerant,
hysteresis
Active high. Indicates that VBUS power is
present.
DRV_PWR_VALID
2
I
LVTTL, 5V
tolerant,
hysteresis
Power / connection indication in hybrid power
systems (VBUS ISD-300A1, brick device).
Functionality and active polarity is controlled
with configuration data. Set DRV_PWR_VALID
= 0 if the functionality is not utilized.
GPIO0 – GPIO9
38, 39, 40, 42, 44, 45,
46, 47, 48, 49
IO
12 mA LVTTL,
5V tolerant,
internal pull-
down resistor
General purpose IO pins. Configuration data
provides independent 3-state control for each
GPIO pin. The GPIO pins may be left as no-
connect if functionality is not utilized.
NCART_DET
37
I
LVTTL, 5V
tolerant,
hysteresis
Active low. Media present indication. If remote
wakeup is enabled by the USB host, a state
change on this pin will cause the ISD-300A1 to
perform a USB remote wakeup event. Filtered
internally by ISD-300A1. Set NCART_DET = 1
if the functionality is not utilized.
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