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參數(shù)資料
| 型號： | SAA8117HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | REFLECTIVE PHOTOSENSOR SMD |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, SOT-407-1, LQFP-100 |
| 文件頁數(shù)： | 31/60頁 |
| 文件大?。?/td> | 231K |
| 代理商： | SAA8117HL |
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1999 Apr 02
31
Philips Semiconductors
Product specification
Digital camera USB interface IC
SAA8117HL
8.9
PSIE-MMU, I
2
C-bus interface and USB RAM
space
The Programmable Serial Interface Engine (PSIE) and
Memory Management Unit (MMU) is the heart of the USB
protocol hardware (see Fig.23). It formats the actual
packets that are transferred to the USB and passes the
incoming packets to the right end-point buffers. These
buffers are allocated as part of the USB RAM space.
The microcontroller communicates via the I
2
C-bus with the
PSIE-MMU. The I
2
C-bus protocol distinguishes three
register spaces. These spaces are addressed via different
commands. The command is sent to the command
address. Depending on the command it is sent to the
PSIE-MMU and/or to the command interpreter which
configures the (de-)mux to open the path to the right
register space. Subsequent write/read to/from the data
address store or retrieve data from the register space is
selected by the command.
8.10
ATX and external ATX interface
The SAA8117HL contains an analog bus driver, called the
ATX. It incorporates a differential and two single-ended
receivers and a differential transmitter. The interface to the
bus consists of a differential data pair (ATXDM and
ATXDP). The SAA8117HL contains also an interface to an
external ATX as backup solution.
Fig.23 I
2
C-bus interface and register map.
handbook, full pagewidth
PI_Address
+
0X
PI_Address
+
10
to/from
microcontroller
I
2
C-BUS
INTERFACE
COMMAND
INTERPRETER
(DE)MUX
to
PSIE-MMU
FCE152
PSIE-MMU
REGISTER
SPACE
SET MODE
REGISTER
SPACE
NON USB
AND
VIDEO FIFO
REGISTERS
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