USB2251-NU-05 Standard Microsystems (SMSC), USB2251-NU-05 Datasheet - Page 13

• Manufacturer Part Number: USB2251-NU-05
• Description: ULTRA FAST USB 2.0 MULTI-SLOT FLASH MEDI
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB2251-NU-05

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Ultra Fast USB 2.0 Multi-Slot Flash Media Controller
Datasheet
SMSC USB2250/50i/51/51i
CF Data 7-0 /
GPIO
IO Ready
CF Card
Detection1
CF Hardware
Reset
CF IO Read
CF IO Write
Strobe
CF DMA request
CF DMA
acknowledge
SM Write Protect
NAME
Table 6.1 USB2250/50i/51/51i 128-Pin VTQFP Pin Descriptions (continued)
CF_RESET_N
CF_DMARQ /
CF_DMACK /
GPIO[23:16]
CF_D[7:0] /
CF_IORDY
(CF_nCD)
CF_nIOW
SYMBOL
CF_nIOR
SM_nWP
GPIO13
GPIO2
GPIO7
RXD /
TXD /
SMARTMEDIA (SM) INTERFACE
128-PIN
VTQFP
117
119
69
67
63
61
59
88
86
85
80
58
79
72
73
47
DATASHEET
BUFFER
I/O12PD
O12PD
13
TYPE
I/O12
I/O12
I/O12
I/O12
O12
O12
O12
O12
IPU
I
CF_D[7:0]: These pins are the bi-directional
data signals CF_D7 - CF_D0 in True IDE
mode data transfer. In True IDE mode, all of
the task file register operations occur on
CF_D[7:0], while data transfer occurs on
CF_D[15:0].
These bi-directional data signals have weak
internal pull-down resistors.
GPIO[23:16]: These pins may be used either
as input, edge sensitive interrupt input, or
output. Custom firmware is required to activate
this function.
This pin is the active high input signal for
IORDY. This pin has a weak internal pull-up
resistor.
This is a GPIO designated by the default
firmware as the Compact Flash card detection
pin.
This pin is an active low hardware reset signal
to the CF device.
This pin is an active low read strobe signal for
the CF device.
This pin is an active low write strobe signal for
the CF device.
CF_DMARQ: This pin is the DMA request
from the device to the CF controller.
RXD: The signal can be used as input to the
RXD of UART in the device. Custom firmware
is required to activate this function.
GPIO: This pin may be used either as input,
edge sensitive interrupt input, or output.
Custom firmware is required to activate this
function.
CF_nDMACK: This pin is an active low DMA
acknowledge signal for the CF device.
TXD: GPIO7 can be used as an output TXD of
UART in the device. Custom firmware is
required to activate this function.
GPIO: This pin may be used either as input,
edge sensitive interrupt input, or output.
Custom firmware is required to activate this
function.
This pin is an active low write protect signal for
the SM device and has a weak pull-down
resistor that is permanently enabled.
DESCRIPTION
Revision 2.0 (09-29-09)