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)： 13/67頁(yè)
文件大?。?/td> 580K
代理商： ISD-300A1
ISD-300A1
8
October 19, 2001
Table 3
describes how the ISD-300A1 determines USB descriptor / configuration sources.
I_MODE
Pin Active
Memory
Device
present
No
No
X
I
2
C
Signature
Check
Passes
ISD-300A1 Configuration and USB Descriptor Retrieval
In this mode, the ISD-300A1 uses internal ROM contents for USB
descriptor information and configuration register values.
This mode
is for debug / manufacturing operation only. Not for shipping
products.
In this mode, the ISD-300A1 uses internal ROM contents for USB
descriptor information. Configuration register values are loaded
from internal ROM.
This is not a valid mode of operation.
The ISD-300A1 retrieves all Descriptor and Configuration values
from the vendor-specific Identify (FBh) data. The ISD-300A1 is
configured using internal ROM values until FBh data becomes
available.
The ISD-300A1 uses internal ROM contents for USB descriptor
information. Configuration register values are loaded from internal
ROM. In this mode of operation, any ISD-300A1 vendor specific
configuration access causes the ISD-300A1 to recheck the signature
field. Once the signature check passes, SROM data is returned for
USB descriptors requests.
This is not a valid mode of operation.
The ISD-300A1 retrieves all Descriptor and Configuration values
from the I
2
C memory device. The ISD-300A1 is configured using
values present in the I
2
C memory device data.
Yes
X
No
Yes
X
Yes
No
Yes
No
No
Yes
Yes
Table 3 – ISD-300A1 Configuration and Descriptor Sources
Internal ROM Contents
Internal on-board ROM addresses and the contents of those locations are shown in the
ISD-300A1
Configuration/USB Descriptor Data Formatting
section on page 9 of this document.
Internal ROM is necessary for manufacturing activities. Internal ROM contents allow the host to
enumerate the ISD-300A1 when an un-programmed I
2
C memory device is connected.
I
2
C Memory Device Interface
The ISD-300A1 supports a subset of the “slow mode” specification (100 KHz) required for 24LC01-16
EEPROM family device support. Features such as “Multi-Master”, “Clock Synchronization” (the SCL pin
is output only), “10-bit addressing”, and “CBUS device support”, are NOT supported. Vendor specific
USB commands allow the ISD-300A1 to address up to 2 K bytes of data (although configuration /
descriptor information is limited to 512 bytes of register space).
Following release of NRESET, the ISD-300A1 waits 50ms, then checks for I
2
C device presence. If an I
2
C
device is present but does not pass signature check (first two data bytes must equal 0x4D54), the ISD-
300A1 re-tests the signature with each vendor specific USB load or read access of configuration bytes 0
and 1. Once the signature check passes, I
2
C data is returned for USB descriptor requests. If an I
2
C device
is detected initially, it is always assumed present until the next reset cycle (NRESET). If an I
2
C device is
present, a lack of an ACK response when required causes the ISD-300A1 to stall that USB request. The
ISD-300A1 will attempt the access again with the next USB request.
Programming of the I
2
C memory device can be accomplished using an external device programmer, ISD-
300A1 supported vendor specific USB commands, or using a “bed of nails”. An example of I
2
C memory
device data formatting is shown in
Appendix A – Example EEPROM or FBh Identify Data Contents
.
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