Ml605 Flash Boot Options - Xilinx ML605 Hardware User's Manual

Figure 1-3
X-Ref Target - Figure 1-3
FLASH_A[22:0]
FPGA U1
Bank 34
S2 SWITCH 6
ON = U4 BPI Upper Half
OFF = U4 BPI Lower Half
FLASH_A[23]
FPGA U1
Bank 24
VCC2V5
510 S2-6
6
7

ML605 Flash Boot Options

The ML605 has two parallel wired flash memory devices as shown in
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
Table 1-5: Platform Flash and BPI Flash Connections
U1 FPGA Pin Schematic Net Name
AL8
AK8
AC9
AD10
C8
B8
E9
E8
ML605 Hardware User Guide
UG534 (v1.9) February 26, 2019
shows a block diagram for the Platform Flash and BPI Flash.
U27
PLATFORM
FLASH
FLASH_D[15:0]
A D
CE
U4
BPI
FLASH
A D
E
A23
4.7K
Figure 1-3: Platform Flash and BPI Flash Block Diagram
shows the connections and pin numbers for the boot flash devices.
Pin Number
FLASH_A0
FLASH_A1
FLASH_A2
FLASH_A3
FLASH_A4
FLASH_A5
FLASH_A6
FLASH_A7
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S1 Switch 4
OFF = Disable System ACE,
ON = Enable System ACE boot when
FPGA U1
VCC2V5
Bank 24
U10
6
PLATFLASH_FCS_B
VCC2V5
510
S2-2
2
1
11
4.7K
VCC2V5
4 3
FLASH_CE_B
U4 BPI Flash
Pin Name
29 A1
25 A2
24 A3
23 A4
22 A5
21 A6
20 A7
19 A8
Detailed Description
enable U4/U27 flash boot
CF card is present
P30_CS_SEL
(FPGA U1 pin AJ12)
S2 SWITCH 2
ON = U4 BOOT
OFF = U27 BOOT
FPGA_FCS_B FPGA U1
Bank 24
UG534_03_011110
Figure 1-3. At ML605
U27 Platform Flash
Pin Number Pin Name
A1
B1
C1
D1
D2
A2
C2
A3
Send Feedback
A00
A01
A02
A03
A04
A05
A06
A07
23