Cypress CY3674, Руководство пользователя

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22 EZ-USB Development Kit User Guide, Doc. # 001-66390 Rev. *D
Advanced Development Board
Note If an EEPROM is connected to the SCL and SDA lines, but does not contain 0xC0 or 0xC2 as
its first byte, the loader reverts to the ‘generic’ case. In other words, the bootloader operates as
though no EEPROM is connected. However, when the 8051 is running, it has full access to any con-
nected EEPROM because the 8051 I
2
C controller is completely independent of the boot load logic.
3.5 Interface Connectors
Table 3-3. Logic Analyzer Pinout
Six 20-pin headers, P1–P6, on the EZ-USB Development Board have pins assigned to be compati-
ble with HP (Agilent) logic analyzers, as shown in
Table 3-3 .
These six headers serve three purposes:
■
They mate with the prototyping board supplied in the EZ-USB DVK.
■
They allow direct connection of the HP (Agilent) logic analyzer pods (Agilent P/N 01650-63203).
■
They allow general-purpose probing by other logic analyzers or oscilloscopes.
Table 3-3 shows the logic analyzer pod pin designations. The EZ-USB signals on P1–P6 are
arranged to fulfill the following requirements:
■
High-speed EZ-USB strobe signals (PSEN, WR#, CLKOUT, IFCLK, and RD#) are connected to
pin 3 of each of the five connectors for P1–P6. Therefore, they are used as the logic analyzer
clock, CLK1.
■
CLK2 is not used. Instead, each connector brings 3.3-V power from the EZ-USB development
board up to the prototype board using pin 2.
■
The signals are logically grouped. For example, the 8051 address bus is on P5 and the EZ-USB
FIFO data, which shares PORTB and PORTD pins, is on P1.
The 20-pin headers on the prototyping board can be stacked. Therefore, it is possible to build cus-
tom circuitry on the prototyping board, plug the board into the EZ-USB development board, and still
plug the logic analyzer pods to the six connectors P1–P6.
Table 3-4 to Table 3-9 show the EZ-USB
pin designations for P1 through P6. The alternate pin names are listed in the last columns.
Agilent 01650-63203 Pod Pins
CLK1 3 4 D15
D14 5 6 D13
D12 7 8 D11
D10 9 10 D9
D8 11 12 D7
D6 13 14 D5
D4 15 16 D3
D2 17 18 D1
D0 19 20 GND