Ultra Fast USB 2.0
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.
5.1USB2250/50i/51/51i 128-Pin VTQFP Pin Descriptions
Table 5.1 USB2250/50i/51/51i
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NAME | SYMBOL | VTQFP | TYPE | DESCRIPTION |
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| COMPACT FLASH INTERFACE | ||
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CF Chip Select 0 | CF_nCS0 | 71 | O12 | This pin is the active low chip select 0 signal |
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| for the task file registers of the CF ATA |
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| device in True IDE mode. |
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CF Register | CF_SA[2:0] | 82 | I/O12 | These pins are the register select address |
Address |
| 83 |
| bits for the CF ATA device. |
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| 84 |
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CF Interrupt | CF_IRQ | 74 | IPD | This is the active high interrupt request |
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| signal from the CF device. |
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| This pin has an internal weak |
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| resistor that can be controlled by: |
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| CF_INTF_EN bit of CFC_ATA_MODE_CTL. |
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CF Data | CF_D[15:8] / | 70 | I/O12PD | CF_D[15:8]: The |
GPIO | GPIO[31:24] | 68 |
| CF_D15 - CF_D8 in True IDE mode data |
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| 66 |
| transfer |
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| 62 |
| In True IDE Mode, all task file register |
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| 60 |
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| operations occur on the CF_D[7:0], while | |
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| 90 |
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| data transfer occurs on CF_D[15:0]. | |
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| 89 |
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| 87 |
| The |
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| weak |
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| I/O12 | GPIO[31:24]: These pins are GPIOs if the |
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| CF_INTF_EN bit of the CFC_ATA_MODE |
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| CTL is disabled and the EXTENDED_GPIO |
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| bit is set in UTIL_CONFIG1 is enabled. |
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SMSC USB2250/50i/51/51i | 11 | Revision 1.1 |
DATASHEET