- 您現(xiàn)在的位置：買(mǎi)賣IC網(wǎng) > PDF目錄1915 > DS31256+ (Maxim Integrated Products)IC CTRLR HDLC 256-CHANNEL 256BGA PDF資料下載
參數(shù)資料
| 型號(hào)： | DS31256+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 16/183頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC CTRLR HDLC 256-CHANNEL 256BGA |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 40 |
| 控制器類型： | HDLC 控制器 |
| 接口： | 串行 |
| 電源電壓： | 3 V ~ 3.6 V |
| 電流 - 電源： | 500mA |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 256-BBGA |
| 供應(yīng)商設(shè)備封裝： | 256-BGA（27x27） |
| 包裝： | 管件 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)當(dāng)前第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)第137頁(yè)第138頁(yè)第139頁(yè)第140頁(yè)第141頁(yè)第142頁(yè)第143頁(yè)第144頁(yè)第145頁(yè)第146頁(yè)第147頁(yè)第148頁(yè)第149頁(yè)第150頁(yè)第151頁(yè)第152頁(yè)第153頁(yè)第154頁(yè)第155頁(yè)第156頁(yè)第157頁(yè)第158頁(yè)第159頁(yè)第160頁(yè)第161頁(yè)第162頁(yè)第163頁(yè)第164頁(yè)第165頁(yè)第166頁(yè)第167頁(yè)第168頁(yè)第169頁(yè)第170頁(yè)第171頁(yè)第172頁(yè)第173頁(yè)第174頁(yè)第175頁(yè)第176頁(yè)第177頁(yè)第178頁(yè)第179頁(yè)第180頁(yè)第181頁(yè)第182頁(yè)第183頁(yè)
DS31256 256-Channel, High-Throughput HDLC Controller
112 of 183
DMA Updates to the Done Queue
The host has two options for when the transmit DMA should write descriptors that have completed
transmission to the done queue. On a channel-by-channel basis, through the done-queue select (DQS) bit
in the transmit DMA configuration RAM, the host can condition the DMA to:
1) Write to the done queue only when the complete HDLC packet has been transmitted (DQS = 0).
2) Write to the done queue when each data buffer has been transmitted (DQS = 1).
The status field in the done-queue descriptor is configured based on the setting of the DQS bit.
If DQS = 0, it is set to 000 when a packet has successfully completed transmission to the status field. If
DQS = 1, it is set to 001 when the first data buffer has successfully completed transmission to the status
field. The status field is set to 010 when each middle buffer (i.e., the second through the next to last) has
successfully completed transmission. The status field is set to 011 when the last data buffer of a packet
has successfully completed transmission.
Error Conditions
While processing packets for transmission, the DMA can encounter a number of error conditions, which
include the following:
PCI error (an abort error)
transmit FIFO underflow
channel is disabled (CHEN = 0) in the transmit DMA configuration RAM
channel number discrepancy between the pending queue and the packet descriptor
Byte count of 0 Bytes in the packet descriptor
If any of these errors occur, the transmit DMA automatically disables the affected channel by setting the
channel enable (CHEN) bit in the transmit DMA configuration RAM to 0. Then it writes the current
descriptor into the done queue with the appropriate error status, as shown in Table 9-H.
Table 9-H. Done-Queue Error-Status Conditions
PACKET
STATUS
ERROR DESCRIPTION
100
Software provisioning error; this channel was not enabled
101
Descriptor error; either byte count = 0 or channel code inconsistent with pending queue
110
PCI error; either parity or abort
111
Transmit FIFO error; it has underflowed
Since the transmit DMA has disabled the channel, any remaining queued descriptors are not transmitted
and are written to the done queue with a packet status of 100 (i.e., reporting that the channel was not
enabled). At this point the host has two options. Option 1: It can wait until all of the remaining queued
descriptors are written to the done queue with an errored status, manually re-enable the channel by
setting the CHEN bit to 1, and then re-queue all of the affected packets. Option 2: As soon as it detects
an errored status, it can force the channel active again by setting the channel reset (CHRST) bit to 1 for
the next descriptor that it writes to the pending queue for the affected channel. As soon as the transmit
DMA detects that the CHRST is set to 1, it re-enables the channel by forcing the CHEN bit to 1. The
DMA does not re-enable the channel until it has finished writing all of the previously queued descriptors
to the done queue. Then the host can collect the errored descriptors as they arrive in the done queue and
re-queue them for transmission by writing descriptors to the pending queue, so the transmit DMA knows
where to find the packets that did not get transmitted (Note: The host must set the next-pending
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS3141+ | IC FRAMER DS3/E3 SNGL 144CSBGA |
| DS31412N | IC 12CH DS3/3 FRAMER 349-BGA |
| DS3150TN | IC LIU T3/E3/STS-1 IND 48-TQFP |
| DS3154N+ | IC LIU DS3/E3/STS-1 QD 144CSBGA |
| DS3164+ | IC ATM/PACKET PHY QUAD 400-BGA |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS31256+ | 功能描述:輸入/輸出控制器接口集成電路 256Ch High Thruput HDLC Cntlr RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| DS31256B | 功能描述:輸入/輸出控制器接口集成電路 256Ch High Thruput HDLC Cntlr RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| DS31256DK | 功能描述:網(wǎng)絡(luò)開(kāi)發(fā)工具 RoHS:否 制造商:Rabbit Semiconductor 產(chǎn)品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評(píng)估:RCM6600W 數(shù)據(jù)速率:20 Mbps, 40 Mbps 接口類型:802.11 b/g, Ethernet 工作電源電壓:3.3 V |
| DS31256-W+ | 制造商:Maxim Integrated Products 功能描述:ENVOY 256 CHANNEL HDLC - WAIVER - Rail/Tube |
| DS312BNC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。