1-8. IC10 SL811HST ( USB Host/Slave Controllers). 1-8-2. Pin Descriptions SERVICE MANUAL 24 Pin No. Signal name Dir Explanation 3 /WR in Write Strobe. Active low. 4 /CS in Chip select. Active low. 5 CM in Clock mode. H: at 12MHz. L: at 48MHz clock source. 6 USBVDD - Power for USB Transceivers. 7 DATA+ i/o USB Differential Data Signal High Side. 8 DATA- i/o USB Differential Data Signal Low Side. 9 USBGND - Ground Connection for USB. 16 CLK/X1 in Clock or External Crystal X1 connection. 17 X2 out External Crystal X2 connection. 18 /RST in SL811HST Device reset. Active low. 19 INTRQ out Interrupt Request output. Active high. 21,39 D[7:0] i/o Connected with CPU bus for communication.
27-29 31-33 40 M/S in Master/Slave Mode select. H: Slave. L: Master. 42 A0 in L:Addr.Pointer.Register. H:Data Buffer or Register. 43 /DACK in DMA Acknowledge. Active low. 44 /DRQ Out DMA Request. Active low. 45 /RD in Read Strobe Input. Active low. 15,41 VDD - Device VDD Power. 9,20 GND - Device Ground. 30