SL811HS
Document 38-08008 Rev. *D Page 22 of 32
33 25 BIDIR D6 Data 6. Microprocessor Data/Address Bus.
34 – NC NC No connection.
35 – NC NC No connection.
36 – NC NC No connection.
37 – NC NC No connection.
38 – NC NC No connection.
39 26 BIDIR D7 Data 7. Microprocessor Data/Address Bus.
40 27 IN M/S Master/Slave Mode Select. ’1’ selects Slave. ’0’ = Master.
41 28[8] VDD +3.3 VDC Device VDD Power.
42[9] 1[9] IN A0 A0 = ’0’. Selects address pointer. Register A0 = ’1’. Selects data
buffer or register.
43 2 IN nDACK DMA Acknowledge. An active LOW input used to interface to
an external DMA controller. DMA is enabled only in slave mode.
In host mode, the pin should be tied HIGH (logic ’1’).
44 3 OUT nDRQ DMA Request. An active LOW output used with an external
DMA controller. nDRQ and nDACK form the handshake for DMA
data transfers. In host mode, leave the pin unconnected.
45 4 IN nRD Read Strobe Input. An active LOW input used with nCS to read
registers/data memory.
46 – NC NC No connection.
47 – NC NC No connection.
48 – NC NC No connection.
Table 35. 48/28-Pin TQFP AXC Pin Assignments and Definitions (continued)
48-Pin TQFP
AXC Pin No. 28-Pin PLCC
Pin No. Pin Type Pin Name Pin Description
Notes
8. VDD can be derived from the USB supply. Figure 5 on p age 19 shows a simple method to provide 3.3V/30 mA. A nother option is t o use a Torex Semiconductor,
Ltd. 3.3V SMD regulator (part number XC62HR3302MR).
9. The A0 Address bit is used to access address register or data registers in I/O Mapped or Memory Mapped applications.