Ultra Fast USB 2.0 Multi-Slot Flash Media Controller

 

 

 

 

Datasheet

Table 5.1 USB2250/50i/51/51i 128-Pin VTQFP Pin Descriptions (continued)

 

 

 

 

 

 

 

 

128-PIN

BUFFER

 

 

NAME

SYMBOL

VTQFP

TYPE

DESCRIPTION

 

 

 

 

 

 

 

Crystal

XTAL1

124

ICLKx

24MHz Crystal or external clock input.

 

Input/External

(CLKIN)

 

 

XTAL: This pin can be connected to one

 

Clock Input

 

 

 

 

 

 

 

 

terminal of the crystal or it can be connected

 

 

 

 

 

to an external 24/48MHz clock when a

 

 

 

 

 

crystal is not used.

 

 

 

 

 

Note: The MA[1:0] pins will be sampled

 

 

 

 

 

while nRESET is asserted, and the

 

 

 

 

 

value will be latched upon nRESET

 

 

 

 

 

negation. This will determine the

 

 

 

 

 

clock source and value.

 

 

 

 

 

 

 

Crystal Output

XTAL2

123

OCLKx

24MHz Crystal.

 

 

 

 

 

This is the other terminal of the crystal, or it

 

 

 

 

 

is left open when an external clock source is

 

 

 

 

 

used to drive XTAL1(CLKIN). It may not be

 

 

 

 

 

used to drive any external circuitry other than

 

 

 

 

 

the crystal circuit.

 

 

 

 

 

 

 

1.8V PLL Power

VDD18PLL

125

 

This pin is the 1.8V Power for the PLL.

 

 

 

 

 

If the internal regulator is enabled, then this

 

 

 

 

 

pin must have a 1.0μF (or greater) ±20%

 

 

 

 

 

(ESR <0.1Ω) capacitor to VSS.

 

 

 

 

 

 

 

3.3V Analog

VDDA33

128

 

3.3V Analog Power

 

Power

 

 

 

 

 

 

 

 

 

 

 

 

 

MEMORY / IO INTERFACE

 

 

 

 

 

 

 

Memory Data

MD[7:0]

33

I/O12

These signals are used to transfer data

 

Bus

 

29

 

between the internal CPU and the external

 

 

 

30

 

program memory.

 

 

 

31

 

Note: These pins have internal weak pull-

 

 

 

34

 

up resistors that are controlled by

 

 

 

35

 

 

 

 

 

the MD_PU_DIS bit of the

 

 

 

36

 

 

 

 

 

PWR_MGMT_CTL1 register.

 

 

 

37

 

 

 

 

 

 

 

 

 

 

 

 

 

Memory Address

MA16

28

O12

These signals address memory locations

 

Bus

 

 

 

within the external memory. MA16 is a bit

 

 

 

 

 

generated by the ROM Mapper.

 

 

 

 

 

 

 

Memory Address

MA[15:2]

2

O12

These signals address memory locations

 

Bus

 

4

 

within the external memory.

 

 

 

107

 

 

 

 

 

1

 

 

 

 

 

113

 

 

 

 

 

24

 

 

 

 

 

111

 

 

 

 

 

109

 

 

 

 

 

106

 

 

 

 

 

108

 

 

 

 

 

110

 

 

 

 

 

112

 

 

 

 

 

114

 

 

 

 

 

116

 

 

 

 

 

 

 

 

 

Revision 1.1 (05-29-08)

16

SMSC USB2250/50i/51/51i

DATASHEET