Sigma DE2-70 manual Fast Ethernet Network Controller

DE2-70 User Manual

VCC5 VCC5 VCC5 VCC5

PS2_KBDAT			R48	120
PS2_KBCLK			R49	120
PS2_MSDAT			R174	120
PS2_MSCLK			R175	120
3	3	3	3

D9	D10	D95	D96
BAT54S	BAT54S	BAT54S	BAT54S

1	2	1	2	1	2	1	2
	VCC33		VCC33		VCC33		VCC33

R46	R47	R172	R173
2K	2K	2K	2K
			KBDAT	1
			MSDAT	2
				3
			KBCLK	5
				6
		VCC5	MSCLK	8
		BC34		BC35
		0.1u

J3

	TOP
8	6

53

2 1

9	PS2
	10 11
0.1u

	Figure 5.16.	PS/2 schematic.
Signal Name	FPGA Pin No.	Description
PS2_KBCLK	PIN_F24	PS/2 Clock
PS2_KBDAT	PIN_E24	PS/2 Data
PS2_MSCLK	PIN_D26	PS/2 Clock (reserved for second PS/2 device)
PS2_MSDAT	PIN_D25	PS/2 Data(reserved for second PS/2 device)

Table 5.14. PS/2 pin assignments.

5.11 Fast Ethernet Network Controller

The DE2-70 board provides Ethernet support via the Davicom DM9000A Fast Ethernet controller chip. The DM9000A includes a general processor interface, 16 Kbytes SRAM, a media access control (MAC) unit, and a 10/100M PHY transceiver. Figure 5.17 shows the schematic for the Fast Ethernet interface, and the associated pin assignments are listed in Table 5.15. For detailed information on how to use the DM9000A refer to its datasheet and application note, which are available on the manufacturer’s web site, or in the Datasheet/Ethernet folder on the DE2-70 System CD-ROM.

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