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Ultra Fast USB 2.0 Multi-Slot Flash Media Controller
Datasheet
SMSC USB2250/50i/51/51i 11 Revision 1.1 (05-29-08)
DATASHEET
Chapter 5 Pin Descriptions
This section provides a detailed description of each signal. The signals are arranged in functional
groups according to their associated interface.
The “n” symbol in the signal name indicates that the active, or asserted, state occurs when the signal
is at a low voltage level. When “n” is not present before the signal name, the signal is asserted at the
high voltage level.
The terms assertion and negation are used exclusively. This is done to avoid confusion when working
with a mixture of “active low” and “active high” signals. The term assert, or assertion, indicates that a
signal is active, independent of whether that level is represented by a high or low voltage. The term
negate, or negation, indicates that a signal is inactive.
5.1 USB2250/50i/51/51i 128-Pin VTQFP Pin Descriptions
Table 5.1 USB2250/50i/51/51i 128-Pin VTQFP Pin Descriptions
NAME SYMBOL
128-PIN
VTQFP
BUFFER
TYPE DESCRIPTION
COMPACT FLASH INTERFACE
CF Chip Select 0 CF_nCS0 71 O12 This pin is the active low chip select 0 signal
for the task file registers of the CF ATA
device in True IDE mode.
CF Register
Address
CF_SA[2:0] 82
83
84
I/O12 These pins are the register select address
bits for the CF ATA device.
CF Interrupt CF_IRQ 74 IPD This is the active high interrupt request
signal from the CF device.
This pin has an internal weak pull-down
resistor that can be controlled by:
CF_INTF_EN bit of CFC_ATA_MODE_CTL.
CF Data 15-8 /
GPIO
CF_D[15:8] /
GPIO[31:24]
70
68
66
62
60
90
89
87
I/O12PD CF_D[15:8]: The bi-directional data signals
CF_D15 - CF_D8 in True IDE mode data
transfer
In True IDE Mode, all task file register
operations occur on the CF_D[7:0], while
data transfer occurs on CF_D[15:0].
The bi-directional data signal has an internal
weak pull-down resistor.
I/O12 GPIO[31:24]: These pins are GPIOs if the
CF_INTF_EN bit of the CFC_ATA_MODE
CTL is disabled and the EXTENDED_GPIO
bit is set in UTIL_CONFIG1 is enabled.