FDC37C669 FDC37C665GT IR CLK14
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3/22/95
DIFFERENCES BETWEEN FDC37C669 FDC37C665GT/IR
using FDC37C669, design will meet REQUIREMENTS RECOMMENDATIONS WINDOWS particular, provides compatibility multiple IRQs, multiple DMAs input/output address relocation. this document, following assumptions made: FDC37C665GT/IR used PC/AT mode, system 3.3V/5V 3.3V. dual footprint accomplished using only seven jumpers. Figure illustrates pins that have different functionality FDC37C665 FDC37C669. following table lists pins that differ: FDC37C665GT/IR DENSEL DRATE1 DRATE0 X1/CLK1 X2/CLK2 IDED7 nIDEENLO nIDEENHI nHDCS0 nHDCS1 nIOCS16 nDACK IRQ3 IRQ4 PINTR FINTR FDRQ DRV2/ADRx/PINTR2 PDACK (IR), PDIR (GT) PDRQ FDC37C669 DRVDEN0 DRVDEN1 IRQ_A CLK14 DRQ_A nDACK_A IRQIN nIDEEN/IRQ_H nHDCS0/IRRX2 nHDCS1/IRTX2 nDACK_B IRQ_C IRQ_D IRQ_E IRQ_F DRQ_B DRV2/ADRx/IRQ_B nDACK_C DRQ_C
Arkay Drive Hauppauge, 11788 (516) 435-6000 (516) 273-3123
description functional differences each follows. DENSEL (pin DRATE1 (pin DRATE0 (pin FDC37C665 onto DRVDEN0 (pin DRVDEN1 (pin FDC37C669. standard operation, (i.e., 4/2/1 3.5", 5.25" FDDS 2/1.6/1 3.5" mode drives) DRVDEN0 connected DENSEL DRVDEN1 connected DRATE0. other operation CR1F FDC37C669 data sheet. FDC37C669, this used IRQ_A. FDC37C665, this external connection parallel resonant crystal. used conjunction with FDC37C669, this external connection single source 14.318 clock. FDC37C665, this used crystal. external clock used, this connected. FDC37C669, this used DRQ_A, request byte transfers data between host chip. used conjunction with DMA_A acknowledge. FDC37C665, this IDED7, which used interface. FDC37C669, this input been removed from chip. Therefore, this used DMA_A acknowledge DRQ_A used (see 21). FDC37C665, this used nIDEENLO, byte enable. FDC37C669, both this signal IDEENHI (pin have been replaced nIDEEN (pin 24). Therefore, this used IRQIN steer interrupt signal from external device onto eight outputs IRQA-H. FDC37C665, this used nIDEENHI, high byte enable. FDC37C669, this signal replaced nIDEEN this control both high bytes interface. This used nHDCS0 both chips when used (see Note This used nHDCS1 both chips when used (see Note FDC37C665, this used indicate when transfers take place. However, transfers allowed bit. Therefore, FDC37C669, when enabled, used input external decoder circuit which used qualify address lines above A11. Thus either logically ORed with A11-A15, connected ground used). This will correspond DACK FDC37C665 when configured FDC37C669 described below (i.e., DRQ_B selected FDC). This FDC37C669 will correspond FDC37C665 when CR28 properly. IRQ3 used serial port (PSP), select IRQ_C serial port setting bits 0011. IRQ3 used serial port (SSP), select IRQ_C serial port setting bits 0011. This FDC37C669 will correspond FDC37C665 when CR28 properly. IRQ4 used serial port (PSP), select IRQ_D serial port setting bits 0100. IRQ4 used serial port (SSP), select IRQ_D serial port setting bits 0100. make this correspond PINTR FDC37C665, select IRQ_E parallel port FDC37C669. bits CR27 0101. make this correspond FINTR FDC37C665, select IRQ_F FDC37C669. bits CR27 0110. make this correspond FDRQ FDC37C665, select DRQ_B (DMA request FDC37C669. bits CR26 0010. This used same both FDC37C665 FDC37C669 three functions DRV2, ADRx PINTR2 (see CR03). This corresponds PDACK FDC37C665 when DRQ_C selected parallel port FDC37C669. This used both chips. FDC37C669 supports 3.3V/5V 3.3V operation, does FDC37C665IR through this pin. There PDIR FDC37C669 there FDC37C665GT. table below illustrates conjunction with different operating voltages.
Operating Voltage
3.3V/5V 3.3V
3.3V 3.3V
3.3V
make this correspond PDRQ FDC37C665, select DRQ_C (DMA request parallel port FDC37C669. bits CR26 0011. Note drive function used, alternate functions used pins 24-26 FDC37C669 i.e., IRQ_H, IRRX2 IRTX2. drive function used, from drive must buffered along with bits controlled IDEEN. Note designer must evaluate decoupling requirements. recommends that decoupling capacitors located close power ground pins.
FIGURE FDC37C669 FDC37C665GT/IR
665: FDRQ 669: DRQ_B
665: FINTR 669: IRQ_F 665: PINTR 669: IRQ_E
665: DRV2/ADRx/PINTR2 669: DRV2/ADRx/IRQ_B 665: PDACK 669: nDACK_C 665: 669: 665(GT): PDIR 665(IR): 665: PDRQ 669: DRQ_C 665: DENSEL 669: DRVDEN0 665: DRATE1 669: DRVDEN1 665: DRATE0 669: IRQ_A 665: CLK1 669: CLK14 665: CLK2 669: DRQ_A 665: IDED7 669: nDACK_A
665: IRQ4 669: IRQ_D 665: IRQ3 669: IRQ_C 665: nDACK 669: nDACK_B
665: nIOCS16 669: 665: nHDCS1 669: nHDCS1/IRTX2 665: nHDCS0 669: nHDCS0/IRRX2 665: nIDEENHI 669: nIDEEN/IRQ_H 665: nIDEENLO 669: IRQIN
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