RELIANCE S-D4007-E數(shù)字量輸入卡件
1.產(chǎn) 品 介 紹
品牌：RELIANCE
型號(hào)說(shuō)明：RELIANCE S-D4007-E數(shù)字量輸入卡件
優(yōu)勢(shì)：供應(yīng)進(jìn)口原裝正品，專業(yè)停產(chǎn)配件。
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2.產(chǎn) 品 詳 情 資 料：
RELIANCE S-D4007-EEPROM/閃存周期時(shí)間EPROM/閃光周期時(shí)間可編程為3至10個(gè)總線時(shí)鐘/字節(jié)（4字節(jié)=12至40）。（實(shí)際循環(huán)時(shí)間可能會(huì)根據(jù)設(shè)備速度而變化。）數(shù)據(jù)傳輸為32位寬。請(qǐng)參閱RELIANCE S-D4007-E嵌入式控制器編程器參考指南。SCSI傳輸RELIANCE S-D4007-E嵌入式控制器包括一個(gè)帶DMA控制器的SCSI大容量存儲(chǔ)總線接口。SCSI DMA控制器使用FIFO緩沖器將8位SCSI總線連接到32位本地總線。FIFO緩沖器允許SCSI DMA控制器以四個(gè)長(zhǎng)字脈沖串的形式將數(shù)據(jù)有效地傳輸?shù)奖镜乜偩€。這減少了SCSI設(shè)備對(duì)本地總線的使用。請(qǐng)參閱《MVME162FX嵌入式控制器程序員參考指南》中的MC2芯片編程模型。DMA控制器的傳輸速率為44MB/秒，32 MHz，奇偶校驗(yàn)關(guān)閉，DRAM和讀周期交錯(cuò)。假設(shè)SCSI總線上的連續(xù)傳輸速率為5MB/sec，則來(lái)自SCSI總線的傳輸將使用12%的本地總線帶寬。RELIANCE S-D4007-E
EPROM/Flash Cycle Times The EPROM/flash cycle time is programmable from 3 to 10 bus clocks/byte (4 bytes = 12 to 40). (The actual cycle time may vary depending on the device speed.) The data transfers are 32 bits wide. Refer to the RELIANCE S-D4007-E Embedded Controller Programmer’s Reference Guide.SCSI Transfers The RELIANCE S-D4007-EEmbedded Controller includes an SCSI mass storage bus interface with DMA controller. The SCSI DMA controller uses a FIFO buffer to interface the 8-bit SCSI bus to the 32-bit local bus. The FIFO buffer allows the SCSI DMA controller to efficiently transfer data to the local bus in four longword bursts. This reduces local bus usage by the SCSI device. Refer to the MC2chip Programming Model in the MVME162FX Embedded Controller Programmer’s Reference Guide. The transfer rate of the DMA controller is 44MB/sec at 32 MHz with parity off and interleaved DRAM and read cycles. Assuming a continuous transfer rate of 5MB/sec on the SCSI bus, 12% of the local bus bandwidth is used by transfers from the SCSI bus.RELIANCE S-D4007-E
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