Service manual

SERVICE MANUAL
24
1-8. IC10 SL811HST (USB Host/Slave Controllers).
1-8-2. Pin Descriptions
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
27-29 D[7:0] i/o Connected with CPU bus for communication.
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
30
GND - Device Ground.