CY2037
Document Number: 38-07354 Rev. *E
Page 6 of 11
CY2037A/CY2037B Versus CY2037-2
CY2037A and CY2037B contain a shadow register in addition to
the EPROM register. The shadow register is an exact copy of the
EPROM register and is the default register when the Valid bit is
not set. It is useful when the prototype or production environment
calls for measuring and adjusting the CLKOUT frequency
several times. Multiple adjustments can be performed with the
shadow register. After the required frequency is achieved the
EPROM register is permanently programmed.
Some production flows do not require the use of the shadow
register. If this is the case, then CY2037-2 is the chosen device
and CY2037-2 has a disabled shadow register. CY2037-3
contains the shadow register.
Frequency Select Feature of CY2037-3
CY2037-3 contains a frequency select function in place of the
powerdown and the output enable functions. With the frequency
select feature, customers can switch two different frequencies
that are configured in the two EPROM rows. Table 4 lists the
definition of the frequency select pin (FS).
Table 4. Frequency Select Pin Decoding for CY2037-3
Inkless Die Pick Map (DPM) Format
Cypress
ships
inkless
wafers
to
customers
with
an
accompanying die pick map, which is used to determine the good
die for assembly and programming. Customers can also access
individual
DPM
files
at
their
convenience
through
ftp.cypress.com with a valid user account login and password.
Contact your local Cypress Field Application Engineer (FAE) or
sales representative for a customer FTP account. The DPM files
are named with the fab lot number and wafer number scribed on
the wafer. The DPM files are transferred to the customer’s FTP
account when the factory ships out the wafers against their
purchase order (PO).
FS Pin
Output Frequency
0
From EPROM row 0 configuration
1
From EPROM row 1 configuration
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