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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
文件頁數(shù): 46/67頁
文件大小: 580K
代理商: ISD-300A1
ISD-300A1
41
October 19, 2001
Operation Control
NEJECT, NCART_DET Pins – USB Remote Wakeup and Event Notification
These pins are used to trigger USB remote-wakeup as well as ATA Event Notification. When asserted low
NEJECT indicates that a media eject request occurred. When asserted low NCART_DET indicates that a
media cartridge is present. For NEJECT, the pin value must remain static for 10 ms before any state
change is detected by internal state machine logic. For NCART_DET, any asynchronous change in state
after the signal retains a static value for more than 10 ms is detected by internal state machine logic.
GPIO Pins – General Purpose IO
The GPIO pins enable general purpose IO for miscellaneous use. Each GPIO pin has independent 3-state
control, with an internal pull down resistor (50K ohm typically). The GPIO pins input, output, and 3-state
control span three bytes of configuration space. The chosen implementation methodology does not allow
read and write operations between GPIO[9:8] and GPIO[7:0] to occur during the same clock period.
!
During read operations GPIO[9:8] are sampled one clock period (33ns) prior to GPIO[7:0]
(assuming the read operation spans all GPIO register space).
!
During write operations GPIO[9:8] 3-state control and output values are latched one clock period
(33ns) prior to GPIO[7:0] 3-state control and output values (assuming the write operation spans all
GPIO register space).
I_MODE Pin – Vendor Specific Identify (FBh) ATA Command (I_MODE)
Asserting the I_MODE pin high enables ISD-300A1 configuration and USB Descriptor data retrieval from
an attached device via a vendor specific ATA command (FBh) rather than an external I
2
C memory device.
Unlike operation with an external I
2
C memory device, I_MODE operation requires the attached device first
be initialized and FBh data retrieved before the ISD-300A1 can allow USB enumeration. To meet USB
specification requirements, I_MODE operation must be limited to systems that draw 100 mA or less from
VBUS prior to USB enumeration.
SYS_IRQ Pin – USB Interrupt
The SYS_IRQ pin provides a way for systems to request service from host software by use of the USB
Interrupt pipe. If the ISD-300A1 has no pending interrupt data to return, USB interrupt pipe data requests
are NAK’d. If pending data is available, the ISD-300A1 returns 16-bits of data indicating the state of the
GPIO[9:0] and DISK_READY pins.
Table 22
and
Figure 4
depicts the bit map and latching algorithm
incorporated by the ISD-300A1.
USB Interrupt Data Byte 1 Bit Map
7
6
5
4
3
2
1
0
USB Interrupt Data Byte 0 Bit Map
6
5
4
7
3
2
1
0
0
0
0
0
0
D
G
G
G
G
G
G
G
G
G
G
Table 22 – USB Interrupt Pipe Data
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