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ML605 Hardware User Guide www.xilinx.com 21
UG534 (v1.2.1) January 21, 2010
Detailed Description
ML605 Flash Boot Options
The ML605 has two parallel wired flash memory devices as shown in Figure 1-3. At ML605
power-up, before FPGA configuration, DIP switch S2 switch 2 selects which flash device,
U4 (BPI) or U27 (Platform Flash), provides the boot bitstream. Typically S2 switch 2 will be
open/OFF to select the U27 Platform Flash. Given that the mode switches (S2 switch
3/M0, switch 4/M1 and switch 5/M2) are set to Slave SelectMAP mode, then U27, driven
at 47 MHz, can load a PCIe core bitstream before a host PC motherboard can scan its PCIe
slots.When S2 switch 2 is closed/ON at power up, the FPGA will be configured from the
BPI flash device U4. Note that U4 address bit A23 is switched by S2 switch 6, which allows
the lower or upper half of U4 to be chosen as a data source.
Table 1-5 shows the connections and pin numbers for the boot flash devices.
Table 1-5: Platform Flash and BPI Flash Connections
U1 FPGA Pin Schematic Net Name
U4 BPI Flash U27 Platform Flash
Pin Number Pin Name Pin Number Pin Name
AL8 FLASH_A0 29 A1 A1 A00
AK8 FLASH_A1 25 A2 B1 A01
AC9 FLASH_A2 24 A3 C1 A02
AD10 FLASH_A3 23 A4 D1 A03
C8 FLASH_A4 22 A5 D2 A04
B8 FLASH_A5 21 A6 A2 A05
E9 FLASH_A6 20 A7 C2 A06
E8 FLASH_A7 19 A8 A3 A07
A8 FLASH_A8 8 A9 B3 A08
A9 FLASH_A9 7 A10 C3 A09
D9 FLASH_A10 6 A11 D3 A10
C9 FLASH_A11 5 A12 C4 A11
D10 FLASH_A12 4 A13 A5 A12
C10 FLASH_A13 3 A14 B5 A13
F10 FLASH_A14 2 A15 C5 A14
F9 FLASH_A15 1 A16 D7 A15
AH8 FLASH_A16 55 A17 D8 A16
AG8 FLASH_A17 18 A18 A7 A17
AP9 FLASH_A18 17 A19 B7 A18
AN9 FLASH_A19 16 A20 C7 A19
AF10 FLASH_A20 11 A21 C8 A20
AF9 FLASH_A21 10 A22 A8 A21
AL9 FLASH_A22 9 A23 G1 A22
AA23 FLASH_A23 26 A24 NC A23