Hi Jason,
while doing a HW schematics I noticed a discrepancy in on the Beaglebone Black Schematics and the DDR3 chip
On Page 7 you have on the DDR3L 4 GB RAM chip a A0 – A15 bus wiring to the AM3558 chip BUT
[cid:image001.png@01D618AC.292C29D0]
But the 2 MICRON Chips MT41K256M16HA-125:E and MT41K256M16TW-107:P say A15 / PIN M7 is not Connected.
[cid:image002.png@01D618AC.292C29D0]
I this an error in the drawing or is A15 for the alternative Kingston Chips you have in your BB Black Parts List.
Strangely you do not get any detailed manual with pin Lazyout for the Kingston chips ??
Can we wire only A0 to A14 and USE onle Micron Chips ??
Please comment.
Best Regards
Bernhard Panait
Bernhard.Panait@globalinvacom.com<mailto:Bernhard.Panait@globalinvacom.com>
Global Invacom Manufacturing Ltd. (APEXSAT)
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Hi Jason,
while doing a HW schematics I noticed a discrepancy in on the Beaglebone Black Schematics and the DDR3 chip
On Page 7 you have on the DDR3L 4 GB RAM chip a A0 – A15 bus wiring to the AM3558 chip BUT
But the 2 MICRON Chips MT41K256M16HA-125:E and MT41K256M16TW-107:P say A15 / PIN M7 is not Connected.
I this an error in the drawing or is A15 for the alternative Kingston Chips you have in your BB Black Parts List.
Strangely you do not get any detailed manual with pin Lazyout for the Kingston chips ??
Can we wire only A0 to A14 and USE onle Micron Chips ??
The Kingston chips use the same pinout, which is specified by JEDEC (“JEDEC Standard No. 79-3C” should do the trick). For 256Mx16 (512MB, 4Gb) devices, A15 isn’t used.
It is really just as simple as the layout supports 512Mx16 (1GB, 8Gb) devices, but aren’t populated that way. If you’ll never use 1GB devices, you don’t need to route A15.
Hi Jason,
while doing a HW schematics I noticed a discrepancy in on the Beaglebone Black Schematics and the DDR3 chip
On Page 7 you have on the DDR3L 4 GB RAM chip a A0 – A15 bus wiring to the AM3558 chip BUT
But the 2 MICRON Chips MT41K256M16HA-125:E and MT41K256M16TW-107:P say A15 / PIN M7 is not Connected.
I this an error in the drawing or is A15 for the alternative Kingston Chips you have in your BB Black Parts List.
Strangely you do not get any detailed manual with pin Lazyout for the Kingston chips ??
Can we wire only A0 to A14 and USE onle Micron Chips ??
The Kingston chips use the same pinout, which is specified by JEDEC (“JEDEC Standard No. 79-3C” should do the trick). For 256Mx16 (512MB, 4Gb) devices, A15 isn’t used.
It is really just as simple as the layout supports 512Mx16 (1GB, 8Gb) devices, but aren’t populated that way. If you’ll never use 1GB devices, you don’t need to route A15.
I forgot to mention to read the DDR routing guides in http://www.ti.com/lit/ds/symlink/am3358.pdf.
Hi Jason,
I have 2 more questions
I see on the Beaglebone schematics several resistors and capacitors with DNI label which I assume is DO NOT INSTALL. This means the resistor and capacitors are not to be installed but the wire/wiring still to be made. PLEASE CONFIRM.
Which leads us to the second question:
On the LAN Chip Page 9 we have 2 split wire going via R124 and R140 DNI to the AM3358 MII1_REFCLK(see below)
I do not have a MII1_REFCLK pin as it is used for other purposes.
As already the “”main” wires from Pin 7 go to MII_RXCLK & Pin 5 go to a Crystal Oscillator I assume the R140 wire and the R124 wires are only Backup clocks and do not need to be attached completely (wire and Resistor) Please confirm.
Best Regards
Bernhard Panait
Bernhard.Panait@globalinvacom.com
Global Invacom Manufacturing Ltd. (APEXSAT)