SL811HS
Document #: 38-08008 Rev. *A
Page 17 of 29
6.1.3
SL811HS USB Host Controller Pins Description
The SL811HS package is a 28-pin PLCC. The device requires 3.3 VDC. Average typical current consumption is less then 20 mA
for 3.3V.
Notes:
4.
The A0 Address bit is used to access address or data registers in I/O-mapped or memory-mapped applications.
5.
The CM Clock Multiplier pin should be tied HIGH for a 12-MHz clock source and tied to ground for a 48-MHz clock source. In SL11H, this pin was designated
as an ALE input pin.
6.
VDD can be derived from the USB supply. The diagram below 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).
7.
The X1/X2 clock requires external 12- or 48-MHz matching crystal or clock source.
Table 6-1. SL811HS Pin Assignments and Definitions
Pin No.
Pin Type
Pin Name
Pin Description
1
IN
A0
A0 = “0.” Selects Address Pointer. Reg. Write Only. Selects Data Buffer or Register.
R/W.[4]
2
IN
nDACK
DMA Acknowledge. An active LOW input used to interface to an external DMA
controller. This works only in slave mode. In host mode, pin should be tied to Logic “1”
in Host Mode.
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, pin must be left
unconnected in Host Mode.
4
IN
nRD
Read Strobe Input. An active LOW input used with nCS to Read registers/data memory.
5
IN
nWR
Write Strobe Input. An active LOW input used with nCS to Write to registers/data
memory.
6
IN
nCS
Active LOW Chip Select. Used with nRD and nWD when accessing SL811HS.
7
IN
CM
Clock Mode. Select Internal 4 X Clock Multiplier. “1” enables 4X clock multiplier. “0”
Disables.[5]
8
VDD1
+3.3 VDC
Power for USB Transceivers
9
BIDIR
DATA +
USB Differential Data Signal HIGH Side
10
BIDIR
DATA -
USB Differential Data Signal LOW Side
11
GND
USB GND
Ground Connection for USB
12
VDD
+3.3 VDC
SL811HS Device VDD Power
[6]
13
IN
CLK/X1
12-/48-MHz Clock or External Crystal X1 Connection[7]
14
OUT
X2
External Crystal X2 Connection
15
IN
nRST
SL811HS Device Active LOW Reset Input
16
OUT
INTRQ
Active HIGH Interrupt Request Output to External Controller
17
GND
GND
SL811HS Device Ground
18
BIDIR
D0
Data 0. Microprocessor Data/(Address) Bus
19
BIDIR
D1
Data 1. Microprocessor Data/(Address) Bus
20
BIDIR
D2
Data 2. Microprocessor Data/(Address) Bus
21
BIDIR
D3
Data 3. Microprocessor Data/(Address) Bus
22
GND
GND
SL811HS Device Ground
23
BIDIR
D4
Data 4. Microprocessor Data/(Address) Bus
24
BIDIR
D5
Data 5. Microprocessor Data/(Address) Bus
25
BIDIR
D6
Data 6. Microprocessor Data/(Address) Bus
26
BIDIR
D7
Data 7. Microprocessor Data/(Address) Bus
27
IN
M/S
Master/Slave Select. Host = “0,” Slave = “1”
28
VDD
+3.3 VDC
SL811HS Device VDD Power
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