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 V
DD
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 page 19 shows a simple method to provide 3.3V/30 mA. Another option is to 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.