DSP56858EVM User Manual, Rev. 3
2-22
Freescale Semiconductor
2.14 USB
A USB version 2.0 interface controller, NetChip NET2270, is connected to the 56858’s external
address/data bus via CS3. The NET2270 is clocked with a 30.00MHz crystal. This allows the
NET2270 interface controller to support the USB Full Speed (12 Mb/sec USB version 1.1) along
with the USB High Speed (480 Mb/sec USB version 2.0) bus transfer rates. The NET2270
provides a USB Tranceiver, Serial Interface Engine, USB Protocol Controller, Endpoint FIFOs,
Local Bus Interface and Configuration Registers. Refer to the USB diagram in
Figure 2-13
. The
USB Interface’s use of CS3 can be disabled by removing the jumper at JG11.
56858
USB Interface
D0-D15
A0-A4
DP
DM
IOR
IOW
CS
JG11
1
Jumper Pin 1-2:
Enable USB
Jumper Removed:
Disable USB
RD
CS3
WR
2
LD0-LD15
LA0-LA4
IRQA
IRQ
2
3
USB
B-TYPE
J5
Figure 2-13. Diagram of the USB Interface
43
IRQB
44
RXD0/PE0
45
IRQA
46
TXD0/PE1
47
+3.3V
48
+3.3V
49
GND
50
GND
51
+5.0V
Table 2-12. Peripheral Daughter Card Connector Description (Continued)
J2
Pin #
Signal
Pin #
Signal
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