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參數(shù)資料
| 型號： | MSM7730 |
| 廠商： | OKI ELECTRIC INDUSTRY CO LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 1 CHANNEL(S), 2M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144 |
| 封裝： | 20 X 20 MM, 0.50 PITCH, PLASTIC, LQFP-144 |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 179K |
| 代理商： | MSM7730 |
–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– s MSM7730 s
9
Oki Semiconductor
Each frame starts with an 80-bit synchronization sequence or preamble, followed by a 16-bit unique
word or start of frame deliminiter (SFD).
The Physical Data Unit (PDU) is a data-whitened version of the MAC data at either 1 or 2 Mbps. The pre-
amble and header are always transmitted at 1 Mbps. The PDU can be transmitted at either 1 or 2 Mbps.
The PHY is required to perform CCA to determine when to transmit, and for the MAC to control the con-
tention back-off timer.
PCMCIA Interface
The MSM7730 provides a PCMCIA host interface mode designed to permit implementation of PC cards
for use with host computers compatible with the PCMCIA PC card standard (Revision 2.1). The interface
supports 16-bit transfers to maximize overall system throughput. In addition, common memory may be
used to access all control registers. This is useful for low-cost card implementations that do not have a
local processor.
The MSM7730 uses attribute memory to configure the device and card. The device decodes the least-sig-
nificant 9-bits of PC card address space, allowing for an attribute memory size of 512 bytes located at
addresses 0x000 - 0x1FF. The attribute memory stores the PCMCIA registers as well as the card informa-
tion structure (CIS) table data. The PCMCIA standard defines four configuration registers. However,
only the Configuration Option and the Configuration and Status registers are supported, not the Pin Replace-
ment and Socket and Copy registers.
The CIS information data is stored in an off-chip serial EEPROM. When the MSM7730 is reset, the con-
tents of the EEPROM are downloaded to shared RAM. Then the information is mapped to attribute
memory space.
PHY
MOD
Data Whitener
Scrambler
Figure 7. Physical Layer Convergence Protocol Block Diagram
Preamble
De-whitener
De-scrambler
Header
State Machine
Formatting
CRC Check
DEMOD
Add arrows
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| MSM80C86ARS | 16-BIT, 5 MHz, MICROPROCESSOR, PDIP40 |
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| MSM80C86A-2JS | 16-BIT, 8 MHz, MICROPROCESSOR, PQCC44 |
相關代理商/技術參數(shù) |
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|---|---|
| MSM7731 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Dual Echo Canceler & Noise Canceler with Dual Codec for Hands-Free |
| MSM7731-01 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Multifunction PCM CODEC (Voice Signal Processor) |
| MSM7731-02 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Dual Echo Canceler & Noise Canceler with Dual Codec for Hands-Free |
| MSM7731-02GAZ020 | 制造商:ROHM Semiconductor 功能描述: |
| MSM7731-02GAZ03A | 制造商:ROHM Semiconductor 功能描述: |
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